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Phrase(s): separate the wheat from the chaff
Prov. to separate what is useful or valuable from what is worthless. • When it comes to books, time will separate the wheat from the chaff. Good books will have lasting appeal, and the rest will be forgotten. • The managers hoped that the new procedure for evaluating employees would separate the wheat from the chaff.
McGrawhill's American Idioms And Phrasal Verbs