let your back hair down

• vi. 不拘礼节(态度随便)

例句

用作不及物动词 (vi.)

1. It's wonderful to let your hair down at the weekend after you've been working hard all week.
   辛苦工作一周後在周末不拘礼节轻松一下真是太好了。
2. Although Americans are very informal, if you prefer to be more formal in social situations, you may freely act in your own way.
   美国人固然不拘礼节，但是你在社交场合中如果高兴守点礼节，尽可照你自己的方式做。