stay up
phrasal verbPart ofstay
stay up — phrasal verb
1. to not go to bed at the usual time; to remain awake past one's normal bedtime.
1.phrasal verb
Definition
to not go to bed at the usual time; to remain awake past one's normal bedtime.
Example
Eleni stayed up until three in the morning to finish her essay on climate change.
The children were allowed to stay up late on New Year's Eve to watch the fireworks.