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killer

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noun [countable] killer pronunciation in British English /ˈkɪlə(r)/ 
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singularkiller
pluralkillers
  1. 1
    someone who kills another person

    The young woman's killer has not yet been found.

    a hired/trained killer

    a child/cop killer (=someone who has killed a child or police officer)

    Synonyms and related words for this sense of killer
    1. a.
      something that kills people

      Cancer is the second largest killer in the US.

      a killer disease/virus

      Synonyms and related words for this sense of killer
    2. b.
      something that kills or destroys something

      weed killer

      a passion killer

      Synonyms and related words for this sense of killer

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