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    killer
    /ˈkɪlə/

    noun

    • 1. a person or thing that kills: "there's a killer on the loose" Similar murdererslaughtererdestroyerliquidator
    • 2. an extremely difficult or unpleasant thing: informal "the shift system was a killer"

    adjective

    • 1. denoting a person or thing that kills: "a killer virus"
    • 2. extremely difficult or unpleasant: informal "I woke up with a killer hangover"

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