loosen up vs unwind

loosen up and unwind both are verbs.

Word	Noun	Adjective	Verb	Adverb
loosen up	No	No	Yes	No
unwind	No	No	Yes	No

As verbs, loosen up and unwind are synonyms defined as:

Other synonyms of loosen up include decompress, relax, slow down, unbend.

As verbs, loosen up and unwind are synonyms defined as:

Other synonyms of loosen up include make relaxed, relax, unlax, unstrain.

loosen up (verb)	unwind (verb)
become less tense, rest, or take one's ease	become less tense, rest, or take one's ease
cause to feel relaxed	cause to feel relaxed
make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity	separate the tangles of
cause to become unblocked	reverse the winding or twisting of
become less tense, less formal, or less restrained, and assume a friendlier manner