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dirty

3 verb
     
dirty3 past tense and past participle dirtied, present participle dirtying, third person singular dirties [intransitive and transitive]
1 to make something dirty
2 to make someone feel or seem bad, dishonest, or immoral:
The army's actions dirtied its reputation.
3

dirty your hands

to do hard physical work, in which your hands become dirty

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