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Phrase(s): It takes two to make a bargain.
Prov. Both parties in a negotiation must agree in order for the negotiation to be successful. • Jill: You’ll give me a ride to work every day this week, like we agreed, won’t you? Jane: Wait a minute. I only said I’d give you a ride to work today. It takes two to make a bargain. • Ellen: We decided you should make dinner tonight, right? Fred: No, we didn’t decide that; you decided that. It takes two to make a bargain.
McGrawhill's American Idioms And Phrasal Verbs