Roget's Thesaurus: Entry 547 (Dupe)

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#547. Dupe.-- N. dupe, gull, gudgeon, gobemouche[obs], cull*, cully[obs], victim, pigeon, April fool[obs]; jay*, sucker*; laughingstock &c 857; Cyclops, simple Simon, flat; greenhorn; fool &c 501; puppet, cat's paw.

V. be deceived &c 545, be the dupe of; fall into a trap; swallow the bait, nibble at the bait; bite, catch a Tartar.

Adj. credulous &c 486; mistaken &c. (error) 495.