Etymology

mi casa, su casa

Today it means: What is mine is yours; a friendly expression of sharing. Full definition →

Spanish mi casa es su casa
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The story

  1. Spanish · borrowed frommi casa es su casa“make yourself at home”
  2. English todaymi casa, su casa

From the Spanish mi casa es su casa (“make yourself at home”, literally “my house is your house”).

Etymology from Wiktionary, CC BY-SA 4.0.