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Phrase(s): Two heads are better than one.
Prov. Two people working together have a better chance of solving a problem than one person working alone. • Come over here and help me balance my checkbook. Two heads are better than one. • Jane: Can you figure out what this insurance document means? Alan: Why ask me? I don’t know anything about insurance. Jane: Neither do I, but two heads are better than one.
McGrawhill's American Idioms And Phrasal Verbs