Dupe \Dupe\, v. t. [imp. & p. p. {Duped}; p. pr. & vb. n. {Duping}.] [Cf. F. duper, fr. dupe. See {Dupe}, n.] To deceive; to trick; to mislead by imposing on one's credulity; to gull; as, dupe one by flattery. Ne'er have I duped him with base counterfeits. -- Coleridge.