I. ˈdüp also ˈdyüp noun
Etymology: French, from Middle French duppe, probably alteration of huppe hoopoe
Date: 1681
: one that is easily deceived or cheated : fool
II. transitive verb
( duped ; dup·ing )
Date: 1704
: to make a dupe of
• dup·er noun
III. noun
Date: circa 1900
: duplicate
• dupe verb