on the house
American Heritage Dictionary of Idioms:
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on the house
At the expense of the establishment, as in This hotel serves an afternoon tea that's on the house. This idiom uses house in the sense of "an inn, tavern, or other building serving the public." [Late 1800s]
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American Heritage Dictionary of Idioms
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Company. All rights reserved.
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