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decimate

verb [T usually passive]
 
 
/ˈdes.ɪ.meɪt/

Definition

to kill a large number of something, or to reduce something severely: Populations of endangered animals have been decimated.KillingMurder and attempted murderBecoming and making smaller or lessBecoming and making less strong
(Definition of decimate verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
Focus on the pronunciation of decimate