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English definition of “stay up”

stay up

verb uk phrasal verb with stay   /steɪ/ us  
B2 to go to bed later than usual: We stayed up (late) to watch a film.
If a football team stays up, it remains in a division and is not relegated (= moved down to a lower division): I think all the newly-promoted clubs have a great chance of staying up this season.
(Definition of stay up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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