point of no return—the point beyond which one must continue on his current course of action, because turning back would be too expensive or dangerous:
- We have finally reached the point of no return where the drums for peace are now louder than the drums for war.
turning point—a decisive moment at which a very significant change for better or worse occurs:
- The Chernobyl disaster was a turning point for the nuclear power worldwide. It demonstrated that nuclear power in parts of the world was not safe enough.