over·bur·den
                    
                                                                                                              
                                                                                                                                  ˌō-vər-ˈbər-dᵊn 
                                                      
                                                          
            
            
              overburdened; overburdening; overburdens            
        
    
                                
              
          
                                                      : to place an excessive burden on                                      
                
                    
                                                                                                                            
                                                            over·bur·den
                    
                                                                                                              
                                                                                                                                  ˈō-vər-ˌbər-dᵊn 
                                                      
                                                          
            
                                
              
          
                                                      : material overlying a deposit of useful geologic materials or bedrock                                      
                
                    
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  Merriam-Webster unabridged




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