errand boy
noun
        US      
      
                                
                                
              
          
                                                      : a person whose job is to run errands for important people                                      
              
                             
He worked his way up from errand boy to regional sales manager.
                         
                
                  —often used figuratively to criticize people by suggesting that they are controlled by someone more powerfulThe governor is nothing more than an errand boy for the big companies in his state.
    
                
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  Merriam-Webster unabridged




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