# 偷天换日

tōu tiān huàn rì

Deceive through a major concealed substitution

## Meaning & wording

**Literally:** Steal the sky and replace the sun

**Traditional Chinese:** 偷天換日

**Register:** Critical · literary

[Choices & judgment](https://chinese-idioms.yudis.dev/idioms/topics/decisions)

## When to use it

Describe audacious fraud that secretly replaces essential facts or objects.

Stronger than a small mistake or ordinary adjustment.

## Understanding the expression

Replacing the sky and sun would be an enormous trick performed as though the world had not changed. The expression therefore describes bold deception through concealed substitution. Someone may replace contract terms, evidence, or genuine goods while preserving an outward appearance of continuity. The changed substance is central. It is not a neutral description of editing or innovation; it condemns the attempt to hide what has actually been exchanged.

## Examples

商家偷天换日，把真货换成了仿品。

### Traditional Chinese

商家偷天換日，把真貨換成了仿品。

shāng jiā tōu tiān huàn rì ， bǎ zhēn huò huàn chéng le fǎng pǐn 。

The seller secretly substituted imitations for genuine goods.

他想偷天换日，偷偷改掉合同附件。

### Traditional Chinese

他想偷天換日，偷偷改掉合同附件。

tā xiǎng tōu tiān huàn rì ， tōu tōu gǎi diào hé tong fù jiàn 。

He tried to deceive everyone by secretly replacing the contract attachment.

监控揭穿了他们偷天换日的手法。

### Traditional Chinese

監控揭穿了他們偷天換日的手法。

jiān kòng jiē chuān le tā men tōu tiān huàn rì de shǒu fǎ 。

Security footage exposed their deceptive substitution.

不能偷天换日，把旧数据包装成新成果。

### Traditional Chinese

不能偷天換日，把舊數據包裝成新成果。

bù néng tōu tiān huàn rì ， bǎ jiù shù jù bāo zhuāng chéng xīn chéng guǒ 。

You cannot pass old data off as new findings through deception.

## Sources & reference checks

Original explanations and examples from Chinese Idioms Almanac. Source-checked October 6, 2026.

- [CC-CEDICT · forms & pronunciation](https://www.mdbg.net/chinese/dictionary?page=worddict&wdqb=%E5%81%B7%E5%A4%A9%E6%8F%9B%E6%97%A5)

- [Ministry of Education · 成語典](https://dict.idioms.moe.edu.tw/idiomView.jsp?ID=415&webMd=1&la=0)

## Keep exploring

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