|1.||to let one's hair down|
In general: to leave behind one's inhibitions or to behave in a way that is free from social limitations or any code of conduct.
(to let one's hair down)
Corrine Bailey Rae, Song:
Put your records on
Girl, put your records on, tell me your favourite song
You go ahead, let your hair down
Sapphire and faded jeans, I hope you get your dreams,
Just go ahead, let your hair down.