Question

let one's hair down держаться неофициально She is always so formal. She never <... her ...>.

Accepted Answer

be relaxed and informal with other people She is always so formal. She never <lets her hair down>.

idiom	let one's hair down
synonyms	be relaxed and informal with other people
translation	держаться неофициально
full_example	She is always so formal. She never <lets her hair down>.
partial_example	She is always so formal. She never <... her ...>.

Hair Formal One's Relaxed Informal People держаться неофициально