Taivo A Taiwan Mandarin dictionary

夙夜匪懈

sùyèfěixiè

ㄙㄨˋ ㄧㄝˋ ㄈㄟˇ ㄒㄧㄝˋ

  1. 1to work from morning to night (idiom)

Keep 夙夜匪懈 and it comes back until you know it.

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