qiān​lǐ​zhī​dī, kuì​yú​yǐ​xué

negligence

千里之堤,溃于蚁穴 (千里之堤,潰於蟻穴) qiān​lǐ​zhī​dī, kuì​yú​yǐ​xué
negligence
A small oversight or minor flaw can lead to the total collapse of a massive undertaking; literally, an ant hole can cause a thousand-mile dike to burst.

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Definitions
CC-CEDICT