loosen (sb) up
— phrasal verb with loosen uk/ˈluː.sən/us/ˈluː.sən/verb 
C2 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, but he soon loosened up.
 A gin and tonic will loosen you up.
Thesaurus: synonyms and related words
Liberating, relaxing and releasing
- chillax
 - decontrol
 - deregulate
 - emancipate
 - exempt
 - free
 - get
 - let/set sth loose idiom
 - liberate
 - loose
 - loosen
 - loosen sb's tongue idiom 1
 - loosen sb's tongue
 - relax your grip/hold idiom
 - release
 - unbind
 - unconfined
 - unhand
 - untethered
 
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