enough is enough
Meaning: You can say "enough is enough" if you think someone shouldn't do something because they've done it too many times already, or because they've been doing it for too long.
- My roommate hadn't paid his share of the rent for two months, so I said, "Enough is enough, Ben. Either find some money for the rent or move out. I can't afford to support you."
- Vicky asked her teacher for the third extension of the deadline for her essay, but he said, "I'm sorry, Vicky, but enough is enough. It's due this Friday, and that's it."