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English definition of “dirty”

dirty

adjective     /ˈdɜːti/
unfair or dishonest: The rival company's dirty tricks campaign had cost it many millions of pounds. a dirty campaign/business dirty dealings/politics/tactics
ENVIRONMENT containing dangerous substances that may be harmful to the environment: dirty air dirty coal plants
do sb's dirty work to do something unpleasant or difficult for someone because they do not want to do it themselves: The building societies have done the chancellor's dirty work for him, by cutting the cost of a mortgage in anticipation of a base rate cut.
quick and dirty produced quickly and without spending much money: Developers make quick and dirty versions of the final product so that the client can interact with it and provide feedback.
(Definition of dirty adjective from the Cambridge Business English Dictionary © Cambridge University Press)
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