point of no return

point of no return

Definition of POINT OF NO RETURN

1

:  the point in the flight of an aircraft beyond which the remaining fuel will be insufficient for a return to the starting point with the result that the craft must proceed

2

:  a critical point at which turning back or reversal is not possible

Yes, "irregardless" is a word. No, that
doesn't mean you should use it. »

First Known Use of POINT OF NO RETURN

1941