get one's comeuppance
to get a deserved punishment. I can't wait till that snobbish girl gets her comeuppance. Joe got his comeuppance when the teacher caught him making fun of her.
get your comeuppance
if you get your comeuppance, something bad happens to you as a result of something bad that you have done to someone else He'll get his comeuppance, you'll see. You can't treat people the way he does and not go unpunished in this world.