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English definition of “gainsay”

gainsay

verb [T often in negatives] uk   /ˌɡeɪnˈseɪ/ (gainsaid, gainsaid) formal us  
to refuse to accept something as the truth: Certainly there's no gainsaying (= it is not possible to doubt) the technical brilliance of his performance.Refusing and rejecting
(Definition of gainsay from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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