devil's advocate
noun
1
                    
                                          
              
          
                                                      : a Roman Catholic official whose duty is to examine critically the evidence on which a demand for beatification or canonization rests                                      
                
                    
2
                    
                                          
              
          
                                                      : a person who champions the less accepted cause for the sake of argument                                      
                
                    
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  Merriam-Webster unabridged




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