夜以继日夜以繼日

yè yǐ jì rì

HSK level: HSK 7–9

Meaning

night and day (idiom); continuous strenuous effort

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Characters

夜yènight, dark; under cover of night亠亻夕以yǐaccording to; so as to; because of; then人继jìto continue, to carry on; to succeed, to inherit纟米日rìsun; day; daytime口一