有关俚语lay one's hair down 的俚语来源,出处(最好有英语原文)以及在日常生活中的运用

let one's hair down

let one's hair down:

使头发下垂散开，不拘礼节，态度随便

to throw off restraint in one's behavior.
those who are doomed to a life of formality for five days a week, look forward to the weekend, when they can let their hair down.