dupe (dp, dyp)
A person who is easily deceived or is used to carry out the designs of another.
tr.v. duped, dup·ing, dupes
To deceive (an unwary person). See Synonyms at deceive.
[French, from Old French, probably alteration of huppe, hoopoe (from the bird's somewhat foolish appearance); see HOOPOE.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.