coup de grâce
noun
            variants  
 or coup de grace
        
    
            
               plural coups de grâce or coups de grace
                                        ˌkü-də-ˈgräs  
    
            
        
    1
                    
                                          
              
          
                                                      : a death blow or death shot administered to end the suffering of one mortally wounded                                      
                
                    
2
                    
                                          
              
          
                                                      : a decisive finishing blow, act, or event                                      
              
                             
The decision to cut funding is the coup de grâce to the governor's proposal.
                         
                
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  Merriam-Webster unabridged




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