Definition of gainsay verb from the Oxford Advanced American Dictionary

     

    gainsay

     verb
    verb
    NAmE//ˌɡeɪnˈseɪ//
     
    , NAmE//ˈɡeɪnseɪ//
     
    gainsay something(formal)Verb Forms present simple I / you / we / they gainsay
     
    he / she / it gainsays
     
    past simple gainsaid
     
    -ing form gainsaying
     
     
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  1. 1(often used in negative sentences) to say that something is not true; to disagree with or deny something synonym deny
  2. 2 Nobody can gainsay his claims.
See the Oxford Advanced Learner's Dictionary entry: gainsay