# do the dirty on

idiom

Source: https://englishreference.com/idiom/do-the-dirty-on
Updated: 2026-08-10

## Meaning

To treat (someone) in an unfair manner; to cheat or betray.

## Examples

- He did the dirty on his best friend by stealing his money.
- I trusted her with my secret, but she did the dirty on me by telling everyone at work.
- After years of loyal service, he felt betrayed when his business partner did the dirty on him by secretly selling the company to their main competitor.

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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.