Learn what "we know arthur's been doing your dirty work" means, when people say it, and how to use it naturally in English.

It means someone is being accused of secretly using another person to do dishonest or unpleasant work for them.
From Killer Romance, Episode 14
Someone is accusing another person of using Arthur to do shady tasks for them.
Use it in a confrontation when you want to accuse someone of indirect or shady behavior. It sounds rude and suspicious, so it is not appropriate for polite workplace conversation.
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