point of no return
noun phrase
1
                    
                                          
              
          
                                                      : the point in the flight of an aircraft beyond which the remaining fuel will be insufficient for a return to the starting point with the result that the craft must proceed                                      
                
                    
2
                    
                                          
              
          
                                                      : a critical point at which turning back or reversal is not possible                                      
                
                    
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  Merriam-Webster unabridged




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