Ответ в теме: English idioms

Main Aditor

to sit up late (to keep late hours) — not to go to bed
at the usual hours
1. Alf and Morris swore they could not sleep. They wanted to sit up all night in order to get down to the wagon on time. (K. Prichard)
2. Bless you! Don’t sit up too late. Anne’s rather in the dumps. (J. Galsworthy)