old boy
noun
1
                    
                                often capitalized O&B                         British 
                                  
              
          
                                                      : an alumnus especially of a boys' school                                      
                
                    
2
                    
                                          
              
          
                                                      : a man who is a member of a long-standing and usually influential clique especially in a professional, business, or social sphere                                      
                
                    
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  Merriam-Webster unabridged




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