adjective, dirt⋅i⋅er, dirt⋅i⋅est, verb, dirt⋅ied, dirt⋅y⋅ing, adverb | 1. | soiled with dirt; foul; unclean: dirty laundry. |
| 2. | spreading or imparting dirt; soiling: dirty smoke. |
| 3. | vile; mean; sordid; contemptible: to play a dirty trick on someone. |
| 4. | obscene; pornographic; lewd: a dirty joke. |
| 5. | undesirable or unpleasant; thankless: He left the dirty work for me. |
| 6. | very unfortunate or regrettable: That's a dirty shame! |
| 7. | not fair or sportsmanlike; unscrupulous: a dirty fighter. |
| 8. | hostile, insulting, contemptuous, or resentful: She gave me a dirty look. He made a dirty crack about the cooking. |
| 9. | (of a nuclear weapon) producing a relatively large amount of radioactive fallout. |
| 10. | (of the weather) stormy; squally: It looks dirty to windward. |
| 11. | Informal. obtained through illegal or disreputable means: dirty money. |
| 12. | appearing as if soiled; dark-colored; dingy; murky. |
| 13. | Slang. using or in possession of narcotics. |
| 14. | Foreign Exchange. (of currency floats) manipulated, as by a central bank influencing or changing exchange rates (opposed to clean ). |
| 15. | to make or become dirty. |
| 16. | Informal. in a mean, unscrupulous, or underhand way: to play dirty. |
| 17. | Informal. in a lewd manner: to talk dirty. |
| 18. | do (someone) dirty, Slang. to treat unfairly or reprehensibly, as by cheating or slandering. |
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In addition to the idioms beginning with dirty, also see down and dirty; wash one's dirty linen in public.