let one's hair down是什么意思？从前西方女孩子外出前，都会把头发盘起来，以示庄重，只有回到家才会卸下别针、头饰，让头发自然地垂着。所以人们就用let one's hair down表示轻松一下了。可译成“放松、无拘束、坦率、无保留”。

1.After work,I always let my hair down and go out to a bar for a drink with my friends.
下班以后我喜欢轻松下来，和朋友一起去酒吧喝酒。

2.They can seldom let their hair down.
他们难得放松一下。

3.Let your hair down and enjoy yourself at the party.
在晚会上别拘束, 尽情享受一下。

4.The best feature of the meeting was that they all let their hair down.
这次会议最大的特点是他们都坦诚地交谈。