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- Point of no return
Point beyond which one must continue on the current course because turning back is impossible
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 ... Wikipedia
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