# duper

/ˈdupɝ/ (US) · /dˈuːpɐ/ (UK) · CEFR C1 · Noun

Source: https://englishreference.com/word/duper
Updated: 2026-05-19

## Definition

someone who tricks or cheats another person. You use this word when you want to say someone is a fraud or a liar.

For teachers: a person who deceives or cheats another; a fraud. Often used in the context of being a 'con man' or a 'swindler'.

## Examples

- He was a total duper who stole my wallet.
- The con artist was a master duper who managed to fool even the most experienced investors.
- In the world of high-stakes poker, a skilled duper can manipulate the odds by reading subtle tells and maintaining a completely impassive expression.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.