CYChengyu Dictionary

Chengyu meaning

温故知新 (wēn gù zhī xīn)

review the old and learn the new

Plain Answer

Source: Analects learning tradition. Treated here as classical story; read it first as a sentence-level judgment.

Core meaning: 温故知新 means review the old and learn the new: Used when revisiting earlier knowledge, experience, or texts produces fresh understanding rather than simple repetition.

Practice this meaningRead the story
Label
positive / common educational and reflective Chinese
Best objects
study review, rereading, team reflection
Do not use when
Do not use 温故知新 for a scene that only shares one surface word with the meaning. If the problem is closer to 举一反三 or the contrast points toward 马马虎虎, choose that nearby entry instead of stretching this one.

Use: Use 温故知新 when the study review sentence shows the object, cause, and tone clearly. Avoid: Avoid 温故知新 when the sentence only sounds related, lacks evidence, or needs a plainer word.

study review复习旧课不是浪费时间，而是温故知新。Fùxí jiù kè bú shì làngfèi shíjiān, ér shì wēn gù zhī xīn.Reviewing old lessons is not a waste of time; it can bring new understanding.

Next: Read the examples, then compare 举一反三 before practicing 温故知新 in the focused quiz.

Often studied with: 举一反三, 学海无涯, 融会贯通

Read This First

温故知新 is introduced here through a modern usage entry rather than a fixed ancient anecdote; the source label is Analects learning tradition, and the page separates that background from modern sentence choice.

温故知新 means review the old and learn the new. The important first reading is Used when revisiting earlier knowledge, experience, or texts produces fresh understanding rather than simple repetition. This is a positive phrase in normal use, so the sentence must show the judgment clearly.

Use 温故知新 when the object, cause, and tone match examples such as study review, rereading, team reflection; then compare 举一反三 and 学海无涯 before writing your own sentence.

Avoid 温故知新 when the sentence only shares a broad topic, when the tone would be unfair to the person being described, or when a plainer word would be clearer than a chengyu.

Start with this cue: study review plus a visible reason.

Meaning and Translation Notes

Used when revisiting earlier knowledge, experience, or texts produces fresh understanding rather than simple repetition.

Literal meaning

warm up the old and know the new

  • 温 / warm or review
  • 故 / old knowledge
  • 知 / know
  • 新 / new understanding

English equivalents

  • review the old to learn the new plain

    Closest for classroom and study contexts.

  • gain new insight from review plain

    Natural when the old material is experience or a text.

  • revisit and see it differently near

    Useful in reflective writing.

How To Use It

Use 温故知新 when the reader can see why review the old and learn the new is the exact judgment, not just the topic. A strong sentence names the actor, the thing being judged, and the evidence that makes this idiom more precise than an ordinary adjective.

  • Use it when review creates fresh understanding.
  • It can apply to books, lessons, projects, personal experience, or older ideas.
  • The tone is positive and reflective rather than mechanical.

Common Mistakes

Do not use 温故知新 for a scene that only shares one surface word with the meaning. If the problem is closer to 举一反三 or the contrast points toward 马马虎虎, choose that nearby entry instead of stretching this one.

  • Do not use it for memorizing old material with no new insight.
  • Do not translate 温 literally as warm unless teaching the character image.

Wrong Use Clinic

The most useful check is often the phrase you should reject.

  1. The learner wants to sound more idiomatic but has only a broad topic match for 温故知新.

    The sentence drops in 温故知新 without showing the cause, object, or tone that would make the idiom necessary.

    Fix: Rewrite the sentence so the evidence for review the old and learn the new appears before or after the phrase.

    温故知新 fails in this case because a chengyu is not decoration; it must name the exact judgment the sentence is making.

    Compare ju yi fan san

  2. The learner wants to say the opposite or a neighboring idea and chooses 温故知新 because it feels familiar.

    The sentence uses 温故知新, but the described situation points to a different cause, time point, or social attitude.

    Fix: Compare the sentence with 马马虎虎 and choose the phrase whose boundary explains the situation with less force.

    温故知新 becomes misleading when the nearby phrase would identify the real problem more cleanly.

    Compare ma ma hu hu

  3. The learner has the right meaning area for 温故知新 but ignores register and emotional force.

    The sentence uses 温故知新 directly about a person, yet gives no softening context or evidence for such a thoughtful and encouraging judgment.

    Fix: Add the observed behavior first, or choose 学海无涯 if the sentence needs a gentler learning path.

    温故知新 can sound heavier than a short English gloss. The reader needs enough context to see why the tone is fair.

    Compare xue hai wu ya

  4. The learner remembers the origin image of 温故知新 but applies it to the wrong object.

    The sentence names an image or story detail, but the real object being judged would be better explained by another chengyu.

    Fix: Name the object first. If the object points toward 刻舟求剑, use that contrast instead.

    温故知新 should follow the judgment, not the most memorable image. Story memory is useful only when it supports the sentence-level decision.

    Compare ke zhou qiu jian

Chengyu Often Studied Together

Use these clusters to build sentence-level judgment instead of memorizing a single gloss.

  1. 温故知新 with nearby learner choices

    温故知新 is often studied beside 举一反三 and 学海无涯 because the words share a theme while asking the learner to judge a different cause, tone, or timing.

    老师先让学生解释温故知新，再比较举一反三和学海无涯，这样不会只凭英文近义词选答案。

    ju yi fan sanxue hai wu ya

  2. 温故知新 with contrast checks

    温故知新 becomes easier to use when it is contrasted with 融会贯通 and 马马虎虎; the contrast forces the writer to decide whether the sentence is praise, warning, correction, or neutral description.

    写作练习里先用温故知新造句，再换成融会贯通，观察判断方向怎样改变。

    rong hui guan tongma ma hu huju yi fan san

  3. 温故知新 in example-building drills

    温故知新 should be practiced with 举一反三 and 融会贯通 because examples reveal whether the learner is choosing by meaning, tone, or only by a remembered image.

    课堂上先用温故知新写一个有证据的句子，再换成举一反三或融会贯通说明判断为什么改变。

    ju yi fan sanrong hui guan tongxue hai wu ya

  4. 温故知新 in story and source review

    温故知新 links best with 学海无涯 and 马马虎虎 when the learner is checking whether a source image truly supports a modern sentence.

    复习出处时，不要只背温故知新的故事，还要比较学海无涯，看哪个成语更能解释现代句子。

    xue hai wu yama ma hu huju yi fan san

Learner Guide

Use these notes when deciding whether this chengyu fits a real sentence.

Use 温故知新 when review produces new insight. The old object can be a lesson, text, project, mistake, tradition, or personal experience. The new result should be an understanding, method, warning, or connection that was not clear before. If the sentence only says to review before an exam, use simpler language unless new insight is visible.

The best English translation is usually review the old to learn the new or gain new insight from review. Revisit and see it differently is more conversational and good for essays or reflection. Avoid warming the old in normal translation unless you are explaining the characters, because it sounds odd in English.

Do not confuse 温故知新 with 学海无涯. 学海无涯 describes the endless scale of knowledge. 温故知新 describes a learning action: going back to old material and discovering new value. A graduation speech may use both, but a sentence about a project retrospective usually needs 温故知新 more specifically.

A strong sentence should show the second look. Rereading after years, reviewing a failed project, or returning to a classic after new experience all work. If there is no return to old material, the phrase loses its core. The old and the new must both be present.

Before using 温故知新, write the plain English idea first. If the plain sentence already says everything naturally, the chengyu must add a sharper judgment, cultural image, or tone. If it does not add one of those, leave the plain wording alone.

A good 温故知新 sentence contains an object and evidence. The object is the person, plan, habit, result, or scene being judged. The evidence is the reason the phrase fits. Without both parts, the idiom may look learned but feel empty.

Compare 温故知新 with 举一反三 and 马马虎虎 before finalizing a sentence. The goal is not to memorize synonyms; the goal is to reject the wrong phrase for a clear reason. That rejection is what turns recognition into usable knowledge.

When teaching or self-reviewing 温故知新, ask the learner to mark source, meaning, use case, wrong case, and one example. If any mark is missing, return to the entry section that supplies it rather than guessing from the headword alone.

study review is the first test zone for 温故知新, but it is not the only possible use. Before using the phrase, name the speaker, the object being judged, and the nearest tested context: study review, rereading, team reflection, usage boundary, misuse boundary, comparison check, context setup, teacher correction. Then choose among review the old to learn the new, gain new insight from review, revisit and see it differently as translation candidates and reject at least one candidate out loud. A useful final check is to compare the sentence with ju-yi-fan-san and xue-hai-wu-ya; if one of those nearby entries explains the situation with less strain, the nearby phrase is the better learner choice.

When 温故知新 is translated as review the old to learn the new, the English should still preserve the phrase's tone. Keep thoughtful and encouraging and the learning use area visible when the audience is still learning the idiom. If a short translation hides the warning "Do not use it for memorizing old material with no new insight.", choose a fuller English explanation instead. This matters because the strongest chengyu pages should help readers decide when not to use the most convenient English equivalent.

Example Sentences

Each example labels the situation so you can choose a natural English translation.

study review

复习旧课不是浪费时间，而是温故知新。

Fùxí jiù kè bú shì làngfèi shíjiān, ér shì wēn gù zhī xīn.

Reviewing old lessons is not a waste of time; it can bring new understanding.

rereading

多年以后重读这本书，我才真正温故知新。

Duō nián yǐhòu chóngdú zhè běn shū, wǒ cái zhēnzhèng wēn gù zhī xīn.

Rereading this book many years later, I finally gained new insight from the old text.

team reflection

项目复盘的目的，是让团队温故知新。

Xiàngmù fùpán de mùdì, shì ràng tuánduì wēn gù zhī xīn.

The purpose of the project review is for the team to draw new lessons from past work.

usage boundary

只有原因和语气都清楚时，这句话才适合用温故知新。

zhi you yuan yin he yu qi dou qing chu shi zhe ju hua cai shi he yong wen gu zhi xin

Only use 温故知新 when the cause and tone are both clear, not just because the topic feels nearby.

misuse boundary

如果只是普通情况，不要为了显得有文化而硬说温故知新。

ru guo zhi shi pu tong qing kuang bu yao wei le xian de you wen hua er ying shuo wen gu zhi xin

If the situation is ordinary, do not force 温故知新 just to make the sentence sound more cultured.

comparison check

比较近义成语以后，再决定这里是不是应该写温故知新。

bi jiao jin yi cheng yu yi hou zai jue ding zhe li shi bu shi ying gai xie wen gu zhi xin

After comparing nearby chengyu, decide whether 温故知新 is really the phrase the sentence needs.

context setup

这段话先说明对象和原因，所以温故知新读起来不突兀。

zhe duan hua xian shuo ming dui xiang he yuan yin suo yi wen gu zhi xin du qi lai bu tu wu

The passage names the object and cause first, so 温故知新 does not feel abrupt.

teacher correction

老师让学生先解释为什么不用别的词，再用温故知新造句。

lao shi rang xue sheng xian jie shi wei shen me bu yong bie de ci zai yong wen gu zhi xin zao ju

The teacher asks students to explain why another phrase would be wrong before writing a sentence with 温故知新.

Story and Cultural Context

温故知新 is commonly associated with Confucian learning. The old material is not dead storage; it becomes active again when a learner revisits it with a changed mind or richer experience. English speakers often understand the phrase best through rereading, review, or retrospectives. A sentence about 温故知新 should show that the second look changes understanding. Without the new insight, the phrase becomes only a polite way to say review. The word 温 can feel strange in English because the image is warming old material back to life. The phrase does not praise repetition for its own sake. It praises a second encounter that reveals something new. A book, lesson, case, or experience may look familiar, but the learner has changed. That change allows new meaning to appear. This is why the phrase works for rereading, project reviews, and long-term study. For this entry, the origin note is only the beginning of the explanation. The useful question is why 温故知新 survived as a portable judgment rather than as a decorative allusion. The modern usage route gives the reader an image, but the modern sentence must still prove its own fit. A learner should ask three things: what concrete object is being judged, what evidence in the sentence supports that judgment, and what tone the phrase adds that a plain English adjective would not add. This is why the page tests 温故知新 through study review, rereading, team reflection, usage boundary, misuse boundary; each context changes the pressure on the phrase and shows whether the idiom is acting as praise, warning, neutral description, or criticism. The story or usage background also has a translation boundary. 温故知新 can point toward review the old to learn the new, gain new insight from review, revisit and see it differently, but those English choices are not interchangeable. One version may preserve the image, another may sound natural in a classroom answer, and another may be safer in a workplace or essay sentence. The entry therefore treats public references as source cards, not as a paragraph order to imitate. Headword checks, story labels, and English equivalents are separated first; only after that are they rebuilt into the learner path used here: answer, label, examples, wrong-use clinic, comparison, story, and practice. The most common failure is overextension. Because 温故知新 has a memorable surface, learners may reach for it whenever a topic feels close. The better habit is to compare it with 举一反三 and 学海无涯 and with 马马虎虎 and 刻舟求剑 before writing. If the rejected phrase is hard to reject, the sentence probably has not supplied enough evidence. If the rejected phrase is easy to reject, the learner can explain the boundary and use 温故知新 with confidence. That is the practical purpose of the origin section: it turns cultural memory into a sentence-level decision instead of leaving the reader with a story and no next action.

Learning point: Good review turns old knowledge into new understanding.

Open the dedicated story page

Editorial Notes

These notes turn the entry into a decision path, not a loose definition.

First answer before details

温故知新 should first be read as a decision about review the old and learn the new, not as a collectible story label. The classical story helps memory, but the reader's real task is to decide whether the modern sentence is making a positive judgment with enough evidence. Start with the object being described, then ask what happened, who is being judged, and whether the tone is fair. If those details are missing, the idiom will feel like learned decoration rather than useful Chinese. This first-answer rule also helps teachers and translators: they can explain the phrase quickly before deciding whether a longer story, comparison, or correction block is needed.

Example clinic

The examples for 温故知新 deliberately cover study review, rereading, team reflection, usage boundary, misuse boundary because a learner needs more than one successful sentence before the phrase becomes usable. Read the Chinese sentence, then explain in plain English why this phrase is more precise than a simple adjective or loose translation. A strong example names the context, shows the evidence, and makes the tone visible. A weak example merely places the chengyu near a related topic. This habit prevents a common error: remembering the literal image but forgetting the social judgment carried by the phrase. When the example feels forced, return to the meaning line and choose a plainer wording.

Comparison boundary

Before using 温故知新, compare it with 举一反三 and 学海无涯 and, when possible, with 马马虎虎 and 刻舟求剑. The comparison is not a synonym game. Nearby chengyu often share effort, caution, wisdom, or evaluation as a topic, while differing in cause, timing, and emotional force. A good learner sentence can explain why the rejected phrase fails. If that explanation is impossible, the chosen idiom is probably too loose. This is also the cleanest internal-link reason: the next page exists because it helps the reader reject a tempting but wrong choice. The comparison should leave a reusable rule, not merely another link to click.

Wrong-use trigger

温故知新 should be rejected when the sentence lacks an object, hides the reason for the judgment, or uses the idiom only because it sounds literary. The safest correction is to rewrite the sentence in plain English first, then add the chengyu only if it sharpens the meaning. If the tone becomes unfair, choose a gentler nearby phrase. If the source image is memorable but the modern object does not match, use the story only as background and do not force the idiom into the sentence. This wrong-use trigger is what keeps the entry from becoming a long but vague dictionary page.

Source synthesis note

温故知新 uses public references as checkpoints rather than as a structure to copy. One source may help with the headword, another with a story or image, and another with English translation range. The page then rebuilds those checks into its own learner order: short answer, label, examples, misuse, collocation, guide, story, and practice. This matters because a single-source paraphrase would give readers a familiar-looking article but not a better learning tool. The editorial value here is the decision path: what to use, what not to use, what to compare, and how to test the phrase in a new sentence.

Practice This Decision

Answer a focused quiz question, then come back to the examples and misuse clinic if the near phrase feels tempting.

Start focused quizReview mistakes first