B2 to go to bed later than usual熬夜,深夜不睡
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.
UK If a football team stays up, it remains in a division and is not relegated (= moved down to a lower division)(足球)俱乐部依然留在原来的联赛级别而没有被降级
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