at liberty

1. 自由的
   You're at liberty to go wherever you like.

   你想去哪儿都可以。

   You are now at liberty to leave any time.

   你现在随时都可以离开。

2. 有空闲的
   I'll be at liberty this afternoon.

   今天下午我有空。

take liberties

1. 过于随便；过分亲昵
   You mustn't take liberties when you're with your elders.

   你与长者在一起时不可过于随便。

   You should not take liberties when you are giving a lecture.

   你讲课时不应该太随便。

• at liberty
  
  1. not imprisoned.
  2. allowed or entitled to do something.
• take liberties with
  
  1. behave in an unduly familiar manner towards.
  2. treat without strict faithfulness to the facts or to an original.
• take the liberty
  venture to do something without first asking permission.