Meaning of loosen up

Definition of loosen up

(verb) cause to become unblocked; "The medicine unstuffed my nose in minutes!"
become less tense, less formal, or less restrained, and assume a friendlier manner; "our new colleague relaxed when he saw that we were a friendly group"
make one's body limber or suppler by stretching, as if to prepare for strenuous physical activity
become less tense, rest, or take one's ease; "He relaxed in the hot tub"; "Let's all relax after a hard day's work"
cause to feel relaxed; "A hot bath always relaxes me"

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