Definition of loosen up phrasal verb from the Oxford Advanced American Dictionary

 

loosen up

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to relax and stop worrying Come on, Jo. Loosen up.

loosen up

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loosen somebody/somethingup

 
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to relax your muscles or parts of the body or to make them relax, before exercising, etc. Dancers were loosening up before going on stage.
See the Oxford Advanced Learner's Dictionary entry: loosen up