Entry 2 senses · 2 variants Webster, 1913 Dupe /(dūp)/ · IPA /duːp/ n. v. t. 01 n. One who has been deceived or who is easily deceived; a gull; as, the dupe of a schemer. 1. One who has been deceived or who is easily deceived; a gull; as, the dupe of a schemer. 02 v. t. To deceive; to trick; to mislead by imposing on one's credulity; to gull; as, dupe one by flattery. imp. & p. p. Duped; p. pr. & vb. n. Duping 1. 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.