showstopper
noun
                                                                                                                            
                                                            show·stop·per
                    
                                                                                                              
                                                                                                                                  ˈshō-ˌstä-pər 
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : an act, song, or performer that wins applause so prolonged as to interrupt a performance                                      
                
                    
2
                    
                                          
              
          
                                                      : something or someone exceptionally arresting or attractive                                      
              
                             
the gold crown was the showstopper of the exhibition
                         
                
                    3
                    
                                          
              
          
                                                      : one that stops or could stop the progress, operation, or functioning of something                                      
                
                    
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  Merriam-Webster unabridged




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