俾夜作昼俾夜作晝

bǐ yè zuò zhòu

Meaning

lit. to make night as day (idiom); fig. to burn the midnight oil; work especially hard

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Characters

俾bǐso that, in order that; to cause亻卑夜yènight, dark; under cover of night亠亻夕作zuòto make; to write, to compose; to act, to perform亻乍昼zhòudaytime, daylight尺旦