Meaning of “loosen up” in the English Dictionary

american-english dictionary

"loosen up" in American English

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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)