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Phrase(s): (Do) you want to step outside?
an expression inviting someone to go outdoors to settle an argument by fighting. • John: Drop dead! Bob: All right, I’ve had enough out of you. You want to step outside? • Bill: So you’re mad at me! What else is new? You’ve been building up to this for a long time. Bob: Do you want to step outside and settle this once and for all? Bill: Why not?
McGrawhill's American Idioms And Phrasal Verbs