on the house | Idiomator

Meaning: (of goods or services)free,complimentary.This voucher entitles you to a free drinkon the house.1960March, G. Freeman Allen, “Europe's most luxurious express - the "Settebello"”, inTrains Illustrated, page146:It is obviously a "plum" job, one distinction being that its motormen are granted an allowance of about 6s.[six shillings]towards the cost of Wagons-Lits food in the crew quarters of the train, [...]. Additionally, by the way, each man is allowed a quarter of a bottle of wine "on the house" per trip!

Examples:

EN: Two gins... on the house.
ES: Dos ginebras. Invita la casa.
EN: Gents, what are you going to have? This is on the house.
ES: Caballeros, ¿qué van a tomar?
EN: - Have a drink on the house.
ES: - Tómate algo, invita la casa.
EN: And then I'll ring you on the house phone .. And you can tell the man you have an important engagement.
ES: Luego te llamaré al teléfono de casa... y le dices a ese hombre que tienes un compromiso importante.
EN: That's three games on the house.
ES: Te debo tres partidas.
EN: Meanwhile, you're going to run on the house, plenty to eat, plenty to drink... and lots of sleep.
ES: Mientras tanto, pueden quedarse en la casa. Tendrán suficiente para comer, bebida en abundancia, y podrán dormir mucho.
EN: Order anything you want, boys. It's on the house.
ES: Pedid lo que queráis, invita la casa.
EN: Have one on the house.
ES: La casa invita.
EN: As though there were a curse on the house.
ES: ¡Como si hubiera una maldición sobre la casa!
EN: - I know, Mac – And that reminds me, I didn't get mine for the insurance on the house.
ES: Por cierto, aún no hice el seguro de mi casa.
EN: Come on! The drinks are on the house!
ES: ¡La casa invita!
EN: Uh, this one in on the house.
ES: Cortesía de la casa.
EN: You can afford one on the house once in a while.
ES: Puede alimentar a una persona.
EN: Here you go, men. Cigars on the house.
ES: Aquí tienen, muchachos.
EN: The drinks are on the house.
ES: Invita la casa.

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