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Definitions of killer
  1. noun
    predatory black-and-white toothed whale with large dorsal fin; common in cold seas
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  2. noun
    someone who causes the death of a person or animal

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  3. noun
    the causal agent resulting in death
    "heart disease is the biggest killer in the United States"

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  4. noun
    a difficulty that is hard to deal with
    "that exam was a real killer"
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