get away with murder
to be allowed to do things that other people would be punished or criticised for it
- He’s so charming that he really does get away with murder.
- You are far too soft on Lily. You let her get away with murder.
get away with sth
— phrasal verb with get
to succeed in avoiding punishment for something
- If I thought I could get away with it, I wouldn’t pay my taxes at all.
- She’s determined that her students will not get away with plagiarism.