intransitive verb
                                          
                    1
                    
      
              
        
    
                                dialectal, England 
                                  
              
          
                                                      : to grimace with the mouth : grin                                      
                
                     
            
   
                   
                      
                      
                    3
                    
      
              
        
    
                                dialectal, England 
                                  
              
          
                                                      : to be sullen or sulky                                      
              
                             make a shift at bearing yourself like a man, not mumping, not moping—
J. G. Cozzens                          
                
                     
            
   
                   
             
                    
                        
        
        
        
                
                
                
        
                
     
    
                                                    
                                                                    
                                                                                                                        
    
    
    
                                                    
                                                                    
                                                                                                                        
    
    
                                            
    
    
    
    
    
    
          
  
          
    
    
            
                
                
                
        
                                                    
              
                    transitive verb
                                          
                                        
      
              
      
                      chiefly dialectal 
                                  
              
          
                                                      : cheat                                      
              
                             some debauched person who will mump you of your daughter—
William Wycherley                          
                
                     
            
   
                   
             
                            
              
                    intransitive verb
                                          
                    1
                    
      
              
        
    
                                dialectal, England 
                                  
              
          
                                                      : beg, sponge                                      
              
                             one prince came mumping to them annually—
T. B. Macaulay                          
                
                     
            
   
                   
                      
                    2
                    
      
              
        
    
                                dialectal, England 
                                  
              
          
                                                      : cheat                                      
                
                     
            
   
                   
             
                    
                        
        
        
        
                
                
                
        
                
     
    
                                                    
                                                                                                                    
            
                                    
                        
                                                    
                                
                       
                                        
                
                                                
                            
            
                                    
                                    
                        
                                            
                                                            
                                    
                                                                
                                
                
                
                
                
                
                
                
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
                                        
                                                    
                            
                                                               
                                                
  
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  Merriam-Webster unabridged
 
                          
                    
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