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Phrase(s): My house is your house. [and] Our house is your house.
Fig. a polite expression said to make a guest feel at home. (From the Spanish phrase Mi casa, su casa.) • Bill: Hello, Tom. Tom (entering): So nice you can put me up for the night. Bill: My house is your house, make yourself at home. • Mary: Come in, you two. Bill: Thanks. Sue: Yes, thank you. Mary: Well, what can I get you? My house is your house.
McGrawhill's American Idioms And Phrasal Verbs