unstuff vs loosen up

unstuff and loosen up both are verbs.

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

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

unstuff (verb)	loosen up (verb)
cause to become unblocked	become less tense, rest, or take one's ease
	cause to feel relaxed
	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