firing line
noun
1
                    
                                          
              
          
                                                      : a line from which fire is delivered against a target                                      
                
                    
2
                    
                                          
              
          
                                                      : the forefront of an activity                                      
                
                  —used especially in the phrase on the firing line
    
                
                    
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  Merriam-Webster unabridged




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