Definition of prey on/upon phrasal verb from the Oxford Advanced American Dictionary

 

prey on/upon

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    prey on/upon somebody/something

     
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  1. 1(of an animal or a bird) to hunt and kill another animal for food Hawks prey on rodents and small birds.
  2. 2to harm someone who is weaker than you, or make use of them in a dishonest way to get what you want Bogus social workers have been preying on old people living alone.