slave driver
noun
            
               plural slave drivers            
        
    1
                    
                                          
              
          
                                                      : someone who is in charge of making enslaved people work                                      
                
                    
2
                    
                                disapproving,  sometimes offensive 
                                  
              
          
                                                      : someone who makes people work very hard                                      
              
                             
He was a slave driver at work.
                         
                
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  Merriam-Webster unabridged




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