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English definition of “annihilate”

annihilate

verb [T] uk   /əˈnaɪ.ə.leɪt/ us  
to destroy something completely so that nothing is left: a city annihilated by an atomic bomb informal to defeat completely: He was annihilated in the finals of the competition.
annihilation
noun [U] uk   /əˌnaɪ.əˈleɪ.ʃən/ us  
During the Cold War the threat of nuclear annihilation was always on people's minds.informal The opposition party's candidate suffered annihilation (= complete defeat) at the polls.
(Definition of annihilate from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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