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From The Collaborative International Dictionary of English v.0.48:
Gainsay \Gain`say"\ (? or ?; 277), v. t. [imp. & p. p. Gainsaid (? or ?); p. pr. & vb. n. Gainsaying.] [OE. geinseien, ageinseien. See Again, and Say to utter.] To contradict; to deny; to controvert; to dispute; to forbid. [1913 Webster] I will give you a mouth and wisdom which all your adversaries shall not be able to gainsay nor resist. --Luke xxi. 15. [1913 Webster] The just gods gainsay That any drop thou borrow'dst from thy mother, My sacred aunt, should by my mortal sword Be drained. --Shak. [1913 Webster]