it would be on the house

题目

it would be on the house
貌似挺口语的

答案

It's on the house.
老板买单.完全免费.
这是一个美国俚语,意思是主人买单、由公家或老板付钱、完全免费,就等于it's free.
再如：
This hotel serves an afternoon tea,that's on the house.
这家旅馆提供免费下午茶.