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point of no return

  1. the moment on a flight when there is no longer enough fuel to return to the starting point
  2. a point in an enterprise, adventure, etc. when participants are too deeply involved or committed to withdraw

See point of no return in American Heritage Dictionary 4

noun pl. points of no return
  1. The point in a course of action beyond which reversal is not possible.
  2. The point in the flight of an aircraft beyond which there is insufficient fuel for return to the starting point.

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