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English definition of “wait up”

wait up

phrasal verb with wait     /weɪt/ verb [I]
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 Learner's Dictionary & Thesaurus © Cambridge University Press)
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