On the house
免费的
例句：
The waitress told us that the drinks were on the house.
服务员告诉我们饮料是在免费的。
On the market:
在市场上 ×
售价 √
例句：
The house is on the market for $1300.
这房子售价1300。
On the tip of my tongue:
在舌尖上 ×
呼之欲出 √
例句：
What's her name?
她叫什么名字？
It's on the tip of my tongue.
刚想到她的名字。
Out of line:
Inappropriate behaviour
在线的外面 ×
举止不当 √
例句：
He got out of line with a customer on the phone and later he had to apologize for what he said.
他在电话里对客户不礼貌，事后，他必须要向客户道歉。
（素材来自学英语口语，如有侵权请联系删除）
