He did the dirty on his best friend by stealing his money.
do the dirty on
idiomTo treat (someone) in an unfair manner; to cheat or betray.
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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air one's dirty laundry in public
To reveal one's sordid secrets to the public.
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air one's dirty linen in public
Synonym of air one's dirty laundry in public.
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dirty laundry
Unflattering or embarrassing facts, or questionable activities that one wants to remain secret, but which someone else may use as blackmail.
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dirty look
An unpleasant or disdainful look or expression, often directed at someone.
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dirty money
Money that is illegally gained, illegally transferred or illegally utilized, especially money gained through forgery, bribery, prostitution, money laundering, or theft.
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dirty pool
Foul play; misconduct; underhandedness.
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dirty word
The name of a topic that a person prefers not to hear or discuss.
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dirty work
One or more unpleasant tasks, assignments, or employment duties, especially those of a disreputable or illicit nature.