1
general::
loosen (sth) up
[ M ]
to prepare your muscles for a physical activity by stretching and doing simple exercises
• I do a few stretches to loosen up before I run., loosen (sb) up
to start to feel less embarrassed and to become more relaxed when you are with other people, or to make someone feel like this
• He seemed quite nervous at the beginning of the meeting, but he soon loosened up.
• A gin and tonic will loosen you up.
Cambridge-Phrasal Verbs