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English definition of “loosen up”

loosen up

to stretch your muscles, esp. by doing special exercises before a hard physical activity: He always spent 20 minutes loosening up before going for his morning run. loosen up To loosen up is also to relax, esp. after being nervous: She was nervous at the beginning of the interview but loosened up after a while.
(Definition of loosen up from the Cambridge Academic Content Dictionary © Cambridge University Press)
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