get what's coming (to one)
To receive what one deserves. Don't worry about those stool pigeons, we'll make sure they get what's coming. After all her hard work, I really hope Mary finally gets what's coming to her.
get what's coming to one
Receive what one deserves or is due, especially something unpleasant, such as a punishment or rebuke. For example, When they suspended Steve for cheating, he was only getting what was coming to him.