The point of no return (PNR or PONR) is the point beyond which one must continue on one's current course of action because turning back is no longer possible, being too dangerous, physically difficult, or prohibitively expensive to be undertaken. The point of no return can be a calculated point during a continuous action (such as in aviation). A particular irreversible action (such as setting off an explosion or signing a contract) can be a point of no return.
Origins and spread of the expression The phrase "point of no return" originated as a technical term in air navigation to refer to the time and/or location during a flight at which the aircraft no longer has enough fuel to return to its originating airfield. Important decisions may need to be made prior to the point of no return, since it will be unsafe to turn around and fly back if the pilot changes their mind after that point. Otherwise, it may correspond to the aircraft's maximal safe range in a situation where the only possible landing site is the takeoff site, for example in the case of an aircraft to an aircraft carrier that is underway and distant from any airfield. In those conditions, an aircraft must always have enough fuel for a return flight, so the "point of no return" may represent the point before which the pilot must return or else risk catastrophe. It can also mean the instance in which an aircraft taxis down a runway, gaining a certain speed, and must become airborne in lieu of a crash or explosion on the runway (V1 speed)—for example, Charles Lindbergh's takeoff in The Spirit of St. Louis in 1927 in which there was uncertainty about the plane's ability to take off from a 5,000-foot mud-soaked runway while fully loaded with aviation fuel. 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.
Related expressions There are a number of phrases with similar or related meaning: The point of safe return (F) is the last point on a route at which it is possible to safely return to the departure airfield with the required fuel reserves still available in the tanks. Continuing past the PSR, the aircraft must either land at its intended destination or divert and land at another nearby airfield should an emergency arise.
"Beyond a certain point there is no return. This point has to be reached." (Original German: "Jenseits eines bestimmten Punktes gibt es keine Rückkehr. Dieser Punkt muss erreicht werden.") This statement appears in the book Betrachtungen über Sünde, Leid, Hoffnung und den wahren Weg ("Reflections on Sin, Suffering, Hope and the True Way") by Franz Kafka. "Crossing the Rubicon" is a metaphor for deliberately proceeding past a point of no return. The phrase originates with Julius Caesar's seizure of power in the Roman Republic in 49 BC. Roman generals were strictly forbidden from bringing their troops into the home territory of the Republic in Italy. On 10 January, Caesar led his army across the Rubicon River, crossing from the province of Cisalpine Gaul into Italy. After this, if he did not triumph, he would be executed. Therefore, the term "the Rubicon" is used as a synonym to the "point of no return". "alea iacta est" ("The die is cast"), which is reportedly what Caesar said at the crossing of the Rubicon. This metaphor comes from gambling with dice: once the die or dice have been thrown, all bets are irrevocable, even before the dice have come to rest. The following expressions also express the idea of a point of no return.
Burn one's bridges. This expression is derived from the idea of burning down a bridge after crossing it during a military campaign, leaving no choice but to continue the march. Figuratively, it means to commit oneself to a particular course of action by making an alternative course impossible. It is most often used in reference to deliberately alienating persons or institutions whose cooperation is required for some action. For instance, "On my last day at my old job, I told my boss what I really think about the company. I guess I burned my bridges."
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