English version

be on the house

From Longman Dictionary of Contemporary Englishbe on the housebe on the houseFREE/COST NOTHINGif drinks or meals are on the house, you do not have to pay for them because they are provided free by the owner of the bar, restaurant etc house
Examples from the Corpus
be on the houseOn New Year's Eve, he offered a glass of champagne to everyone, on the house.The owner let us have the first bottle of wine on the house.First drink is on the house.
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