夜以继日

yèyǐjìrì

HSK 7

夜以继日 — yèyǐjìrì

1. day and night; to work continuously without rest (often describing strenuous effort)

   为了按时完成项目，我们夜以继日地工作。 wèile ànshí wánchéng xiàngmù wǒmen yèyǐjìrì dì gōngzuò — To finish the project on time, we worked day and night.