Longman Dictionary of Contemporary English homepage

dirty

2 adverb
     
dirty2 informal
1

play dirty

to behave in a very unfair and dishonest way, especially in a competition or game:
a team that plays dirty
2

talk dirty

to talk about sex using offensive words
3

dirty great/dirty big

British English spoken extremely big:
a dirty great snake
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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