Quick definitions from WordNet (loosen up)
▸ verb: become less tense, less formal, or less restrained, and assume a friendlier manner
▸ verb: become less tense, rest, or take one's ease
▸ verb: cause to become unblocked
▸ verb: make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
▸ verb: cause to feel relaxed
▸ Words similar to loosen up
▸ Usage examples for loosen up
▸ Words that often appear near loosen up
▸ Rhymes of loosen up
▸ Invented words related to loosen up
▸ verb: become less tense, less formal, or less restrained, and assume a friendlier manner
▸ verb: become less tense, rest, or take one's ease
▸ verb: cause to become unblocked
▸ verb: make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
▸ verb: cause to feel relaxed
▸ Words similar to loosen up
▸ Usage examples for loosen up
▸ Words that often appear near loosen up
▸ Rhymes of loosen up
▸ Invented words related to loosen up