Significa “sciogliersi i capelli” e cioè “lasciarsi andare“, “rilassarsi“.
Ovviamente puo’ essere usato in tutte le forme, cioè “Let your hair down“, “he let his hair down“, etc …)
Come on , Susan! Let your hair down and join us on the dancefloor!
After the good news, we all let our hair down.
