point no return

point of no return

noun
1.
Aviation. the point in a flight at which an aircraft will lack sufficient fuel to return to its starting point.
2.
the critical point in an undertaking, decision-making process, etc., where one has committed oneself irrevocably to a course of action or policy.

Origin:
1940–45

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
point of no return
 
n
1.  a point at which an irreversible commitment must be made to an action, progression, etc
2.  a point in a journey at which, if one continues, supplies will be insufficient for a return to the starting place

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