不分昼夜不分晝夜

bù fēn zhòu yè

Meaning

day and night; round-the-clock

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Characters

不bùno, not, un-; negative prefix一分fēnto divide, to allocate; fraction; small unit of time or other quantity八刀昼zhòudaytime, daylight尺旦夜yènight, dark; under cover of night亠亻夕