let down (one's) hair

(redirected from let down his hair)
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let down (one's) hair

To cease acting formally or conservatively; to let go of one's inhibitions or reservations. Come on, Jim, this is a party! Let down your hair and go a little wild!
See also: down, hair, let
References in periodicals archive ?
Many point out that, after serving in Afghanistan, he deserves to let down his hair.