to relax and stop worrying; to relax your muscles or parts of the body or to make them relax, before taking exercise, etc.
Oxford81% of films
to relax and stop worrying
-You gotta loosen up a bit, man. -I, uh…
Oxford13% of films
to relax your muscles or parts of the body or to make them relax, before taking exercise, etc.
Definitions from the Oxford Advanced Learner's Dictionary, 9th edition