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English definition of “perk (sb) up”

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perk (sb) up

verb [I or T] uk phrasal verb with perk   /pɜːk/ us    /pɝːk/ informal
to become or cause someone to become happier, more energetic, or more active: She perked up as soon as I mentioned that Charles was coming to dinner. He perked up at the news. Would you like a cup of coffee? It might perk you up a bit.
(Definition of perk (sb) up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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