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Definition of killer noun from the Oxford Advanced American Dictionary

     

    killer

     noun
    noun
    NAmE//ˈkɪlər//
     
     
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  1. 1a person, an animal, or a thing that kills Police are hunting his killer. Heart disease is the biggest killer in the U.S. an electric insect killer The players lacked the killer instinct. see also ladykiller, serial killer
  2. 2(informal) something that is very difficult, very exciting, or very skillful The exam was a real killer. The new movie is a killer.