unwind vs loosen up

unwind and loosen up both are verbs.

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

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

Other synonyms of unwind include decompress, relax, slow down, unbend.

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

Other synonyms of unwind include make relaxed, relax, unlax, unstrain.

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