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The idiom '物腐虫生' (Worms breed in decaying matter) is famously linked to a historical event from the late Qin Dynasty in China.
Fan Zeng, a strategist for Xiang Yu, had devised a plan to eliminate Liu Bang at the Hong Gate Banquet. However, due to Xiang Yu's indecisiveness, Liu Bang managed to escape.
Later, Liu Bang cunningly spread rumors to discredit Fan Zeng and drive a wedge between him and Xiang Yu. Xiang Yu, falling victim to the scheme, began to distance himself from his loyal advisor, Fan Zeng.
This internal breakdown and mistrust ultimately weakened Xiang Yu, leading to his defeat by Liu Bang.
The Song Dynasty scholar Su Shi later reflected on this in his 'Discourse on Fan Zeng,' stating, 'Things must first decay before worms are born; people must first be suspicious before slander can penetrate them.' This quote perfectly encapsulates the idiom's meaning: internal vulnerabilities or flaws are the prerequisites for external troubles or attacks.

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Open the tool →物腐虫生 (wù fǔ chóng shēng) is a Chinese idiom (chengyu) meaning “Worms breed in decaying matter. This idiom implies that troubles or misfortunes arise from internal weaknesses or vulnerabilities; one must have inherent flaws for others to take advantage of and inflict harm”.
物腐虫生 is pronounced wù fǔ chóng shēng in Mandarin Chinese.
Literally, 物腐虫生 means “Decaying matter breeds worms”. It is used to mean “Worms breed in decaying matter. This idiom implies that troubles or misfortunes arise from internal weaknesses or vulnerabilities; one must have inherent flaws for others to take advantage of and inflict harm”.
物腐虫生 comes from a classical Chinese story dating back to ancient China. The full story is on this page.
东西腐烂了才会生虫。比喻祸患的发生,总有内部的原因。也比喻本身有了弱点,别人才能乘机打击。