작심삼일

short-lived plan; short-lived resolution

Explanation

〔作心三日〕

[작씸사밀]

short-lived plan; short-lived resolution
A word meaning that one cannot keep one's resolution longer than three days, namely that one's resolution is not strong and firm.

Examples
작심삼일이 되다
작심삼일로 끝나다
새해부터 일찍 일어나겠다는 결심은 작심삼일로 끝나고 말았다

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