Meaning of “stay up” in the English Dictionary

"stay up" in British English

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stay up

phrasal verb with stay uk /steɪ/ us /steɪ/ verb

B2 to go to bed later than usual:

We stayed up (late) to watch a film.

More examples

  • I stayed up to watch the Olympics on television.
  • The kids were allowed to stay up till midnight on New Year's Eve.
  • I'll be late home so don't stay up waiting for me.
  • We stayed up till 3.00, chatting about old times.
  • These days if I stay up late one night I'm exhausted the next morning.

(Definition of “stay up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)