lightning rod
noun
1
                    
                                          
              
          
                                                      : a grounded metallic rod set up on a structure (such as a building) to protect it from lightning                                      
                
                    
2
                    
                                          
              
          
                                                      : one that serves to divert attack from another                                      
                
                    
3
                    
                                          
              
          
                                                      : one that is a frequent target of criticism or focus of controversy                                      
              
                             
she has become a convenient lightning rod for voters' discontent with law-and-order issues— Aric Press et al.
Aric Press et al.
                         
                
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  Merriam-Webster unabridged




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