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If you have something on the house, it is given to you free by a business.
由商家免费提供的
All the drinks were on the house.
所有的饮料都是免费的。
The owner knew about the engagement and brought them glasses of champagne on the house.
店主知道了他们订婚的事，便免费请他们喝了几杯香槟酒。