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Phrase(s): Were you born in a barn?
Rur. an expression chiding someone who has left a door open or who is ill-mannered or messy. • Andy: Close the door! Were you born in a barn? Bob: Sorry. • Fred: Can’t you clean this place up a little? Were you born in a barn? Bob: I call it the messy look.
McGrawhill's American Idioms And Phrasal Verbs