dirty look

air one's dirty laundry in public

To reveal one's sordid secrets to the public.

air one's dirty linen in public

Synonym of air one's dirty laundry in public.

Butcher's

[Cockney slang]look

via butcher's hook

dirty laundry

Unflattering or embarrassing facts, or questionable activities that one wants to remain secret, but which someone else may use as blackmail.

dirty money

Money that is illegally gained, illegally transferred or illegally utilized, especially money gained through forgery, bribery, prostitution, money laundering, or theft.

dirty pool

Foul play; misconduct; underhandedness.

dirty word

The name of a topic that a person prefers not to hear or discuss.

dirty work

One or more unpleasant tasks, assignments, or employment duties, especially those of a disreputable or illicit nature.