刻舟求劍

Simplified: 刻舟求剑

On the HSK 7-9 vocabulary list, at CEFR level C2.

zhōuqiújiàn ㄎㄜˋ ㄓㄡ ㄑㄧㄡˊ ㄐㄧㄢˋ

    • lit. a notch on the side of a boat to locate a sword dropped overboard (idiom) fig. an action made pointless by changed circumstances

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Sources