Noun
a line that when crossed permits of no return and typically results in irrevocable commitment
Source: WordNetThere is a point at which everything becomes simple and there is no longer any question of choice, because all you have staked will be lost if you look back. Life's point of no return. Dag Hammarskjöld
When swimming into a dark tunnel,there arrives a point of no return when you no longer have enough breath to double back.your choice is to swim forward into the unknown....and pray for an exit. Dan Brown
In everybody's life there's a point of no return. And in a very few cases, a point where you can't go forward anymore. And when we reach that point, all we can do is quietly accept the fact. That's how we survive. Haruki Murakami
Every major technological innovation propels humanity forward to the point of no return. Newton Lee
You get a wonderful view from the point of no return. Terry Pratchett
However they may have felt when they left they were now committed, they had passed the point of no return. Hubert Selby Jr.