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English definition of “loosen (sb) up”

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loosen (sb) up

verb uk phrasal verb with loosen   /ˈluː.sən/ us  
C2 to start to feel less embarrassed and to become more relaxed when you are with other people, or to make someone feel like this: He seemed quite nervous at the beginning, but he soon loosened up. A gin and tonic will loosen you up.
(Definition of loosen (sb) up from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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