Meaning of “open house” in the English Dictionary

"open house" in British English

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open housenoun

uk /ˌəʊ.pən ˈhaʊs/ us /ˌoʊ.pən ˈhaʊs/

[ C ] mainly US UK usually open day a day when an organization such as a school, college, or factory allows members of the public to go in and see what happens there

[ C ] a time when a house or apartment that is being sold can be looked at by the public

[ U or S ] UK a situation in which people welcome visitors at any time:

We keep open house, so come and see us any time.

(Definition of “open house” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"open house" in American English

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open housenoun

us /ˈoʊ·pən ˈhɑus/

open house noun (PARTY)

[ C usually sing ] a party at which visitors are welcome in your home:

We’re having an open house on Sunday.

open house noun (HOUSE FOR SALE)

[ C usually sing ] a time when a house or apartment that is being sold or is available for rent can be looked at by the public

open house noun (PUBLIC EVENT)

[ C ] an occasion when an organization such as a school or college allows members of the public in to see what happens there

(Definition of “open house” from the Cambridge Academic Content Dictionary © Cambridge University Press)