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English definition of “wait up”

wait up

verb [I] uk phrasal verb with wait   /weɪt/ us  
to not go to bed at night because you are expecting someone to arrive: I'll be home after midnight, so don't wait up for me.Not sleeping and not unconsciousWaitingStaying and remaining
(Definition of wait up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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