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English definition of “killer”

killer

noun [C]    /ˈkɪl·ər/
someone or something that causes someone or something to die : The police haven’t found the killer yet . Heart disease is a killer (= cause of death ). infml If something is described as a killer, it is very difficult : The test was a real killer. infml A killer is also someone or something that is very entertaining or skilled : Dizzy was a killer on the trumpet .
(Definition of killer noun from the Cambridge Academic Content Dictionary © Cambridge University Press)
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