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- let hair down
let hair down
let one's hair down
1. Lit. to undo one's hair and let it fall freely. When she took off her glasses and let her hair down, she was incredibly beautiful.
2. Fig. to tell [someone] everything; to tell one's innermost feelings and secrets. Let your hair down and tell me all about it. Come on. Let your hair down and tell me what you really think.
let your hair down
to relax and do what you want The party gives you a chance to let your hair down at the end of the week.
let your hair down
to relax and enjoy yourself without worrying what other people will think It's nice to let your hair down once in a while and go a bit wild.
let (one's) hair down
To drop one's reserve or inhibitions.