Definition
To relax and enjoy oneself without inhibitions; to behave in a more casual and unrestrained way than usual.
放鬆心情，盡情享受；擺脫拘束，輕鬆自在。
After a long week of work, it's time to let your hair down.
經過一週的工作後，是時候放鬆一下了。
At the party, she really let her hair down and danced the night away.
在派對上，她真的放開了自己，整晚都在跳舞。
It's good to let your hair down every now and then.
偶爾放鬆一下是很好的。