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Phrase(s): (It) takes two to tango.
Prov. Some things cannot happen by one person acting alone. • Alan: You’re always arguing! Stop arguing all the time. Jane: I can’t argue all by myself. It takes two to tango. • Fred: Did you hear? Janice got herself pregnant. Jill: Well, she didn’t do it all by herself. Takes two to tango, you know.
McGrawhill's American Idioms And Phrasal Verbs