past master
noun
1
                    
                                          
              
          
                                                      : one who has held the office of worshipful master in a lodge of Freemasons or of master in a guild, club, or society                                      
                
                    
2
                    
                                  
          
[alteration of passed master]                                  
              
          
                                                      : one who is expert : adept                                      
                
                    
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  Merriam-Webster unabridged




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