point of no return

noun phrase

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

First Known Use of point of no return

1941, in the meaning defined at sense 1

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The first known use of point of no return was in 1941

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