loosen up
Verb
Meaning
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
cause to feel relaxed
cause to become unblocked
become less tense, less formal, or less restrained, and assume a friendlier manner
Source: WordNetSynonyms
Antonyms
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Examples
He relaxed in the hot tub
Let's all relax after a hard day's work
A hot bath always relaxes me
The medicine unstuffed my nose in minutes!
our new colleague relaxed when he saw that we were a friendly group
And starting in May, they started to loosen up and by June, all the stores were open and in July, we're doing quite well.