loosen up vs unstuff

loosen up and unstuff both are verbs.

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

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

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