day and night; turning night into day
Set phrase meaning to work or do something continuously without regard for day or night, often implying intense effort or urgency.
They carried on the construction day and night.
Before the exam, I studied day and night.
Standard kanji spelling for this set phrase.
Kana spelling of 継いで; less common but still encountered.
Literally 'continuing night into day'; a fixed idiomatic expression. The exact origin is uncertain, but it has been used since at least the Edo period.