Meaning of “loosen (sth) up” in the English Dictionary

british dictionary

"loosen (sth) up" in British English

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loosen (sth) up

phrasal verb with loosen uk /ˈluː.sən/ us /ˈluː.sən/ verb

to prepare your muscles for a physical activity by stretching and doing simple exercises:

I do a few stretches to loosen up before I run.

(Definition of “loosen (sth) up” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)