accumulate
verb
                                                                                                                            
                                                            ac·cu·mu·late
                    
                                                                                                              
                                                                                                                                  ə-ˈkyü-m(y)ə-ˌlāt  
                                                      
                                                          
            
            
              accumulated; accumulating            
        
    
                                
              
          
                                                      : to gather or pile up especially little by little : amass                                      
              
                             
accumulate a fortune
                         
                
                    
                                
              
          
                                                      : to increase gradually in quantity or number                                      
              
                             
snow accumulating to a depth of several feet
                         
                
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  Merriam-Webster unabridged




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