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Point of no return
The point of no return is the point beyond which one must continue on one's current course of action because turning back is physically impossible, prohibitively expensive, or dangerous. A particular irreversible action (e.g., setting off an explosion or signing a contract) can be a point of no return, but the point of no return can also be a calculated point during a continuous action (such as in aviation).
== Origins and spread of the expression ==
The term ''PNR''—"point of no return," more often referred to by pilots as the "Radius of Action formula" — originated, according to the ''Oxford English Dictionary'', as a technical term in air navigation to refer to the point on a flight at which, due to fuel consumption, a plane is no longer capable of returning to the airfield from which it took off.
The first major metaphorical use of the term in popular culture was in the 1947 novel ''Point of No Return'' by John P. Marquand. It inspired a 1951 Broadway play of the same name by Paul Osborn. The novel and play concern a pivotal period in the life of a New York City banker. In the course of the story, the character faces two "point of no return" realities: First, that his quest for a big promotion will mean either triumph or a dead end to his career, and second, that he can never go back to the small-town life he abandoned as a young man.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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