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Phrase(s): If you lie down with dogs, you will get up with fleas.
Prov. If you associate with bad people, you will acquire their faults. • Granddaughter: It’s not fair. I’m starting to get a bad reputation just because I’m friends with Suzy and she has a bad reputation. Grandmother: It’s only natural. People think that if you lie down with dogs, you will get up with fleas.
McGrawhill's American Idioms And Phrasal Verbs