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Phrase(s): 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.
McGrawhill's American Idioms And Phrasal Verbs