Mawson, C.O.S., ed. (1870–1938). Roget’s International Thesaurus. 1922.

Class IV. Words Relating to the Intellectual Faculties
Division (II) Communication of Ideas
Section II. Modes of Communication

547. Dupe.

   NOUN:DUPE, gull, gudgeon, gobemouche [F.], cully, victim, April fool; jay, sucker, pigeon, cull [all slang]; laughingstock [See Laughingstock]; simple Simon, flat [colloq.], greenhorn; fool [See Fool]; puppet, cat’s-paw.
   VERB:BE DECEIVED [See Deception], be the dupe of; fall into a trap; swallow -, nibble at- the bait; bite; catch a Tartar.
  MISTAKEN (error) [See Error].