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Phrase(s): Birds of a feather flock together.
Prov. Similar people tend to associate with each other. • I always thought Amy was pretentious, and now she’s going out with that snobbish boy, Louis. Birds of a feather flock together. • George: Why do you think Donald is dishonest? Ned: All his friends are dishonest. Birds of a feather flock together.
McGrawhill's American Idioms And Phrasal Verbs