Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Origin: gain- 'against' (13-16 centuries) (from Old English gegn) + say

gainsay

verb
     
gain‧say past tense and past participle gainsaid [transitive usually in negatives] formal
to say that something is not true, or to disagree with someone [= contradict]:
No one dared to gainsay him.

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