decompress vs loosen up

decompress and loosen up both are verbs.

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

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

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

decompress (verb)	loosen up (verb)
become less tense, rest, or take one's ease	become less tense, rest, or take one's ease
decrease the pressure of	cause to feel relaxed
restore to its uncompressed form	make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
	cause to become unblocked
	become less tense, less formal, or less restrained, and assume a friendlier manner