Definition of "dupe"

dupe¹

/djuːp/

noun
plural dupes
1. A person who has been deceived.
  Quotations
  It would vex me, indeed, to see you again the dupe of Miss Bingley's pretended regard.
  1813 January 27, [Jane Austen], chapter 55, in Pride and Prejudice: […], volumes (please specify |volume=I to III), London: […] [George Sidney] for T[homas] Egerton, […]
verb
third-person singular simple present dupes, present participle duping, simple past and past participle duped
1. To swindle, deceive, or trick.

dupe²

/djuːp/

noun
plural dupes
1. (photography) A duplicate of a photographic image.
2. (restaurant industry) A duplicate of an order receipt printed for kitchen staff.
3. (informal) A duplicate.
4. (informal, TikTok) A counterfeit; a fake.
  Quotations
  TikTok could potentially be liable if lots of users are directing other users to the sales of dupes, she said, and she said if users have an affiliate relationship with the sellers of counterfeit goods, they could also potentially be liable.
  2020 March 1, Megan Graham, “TikTok teens are obsessed with fake luxury products”, in CNBC‎
verb
third-person singular simple present dupes, present participle duping, simple past and past participle duped
1. (transitive) To duplicate.
  Quotations
  That night, a shaken camera operator dupes the tape and leaks a copy to the press.
  2018, Richard Powers, The Overstory, Vintage (2019), page 379