topwork
verb
                                                                                                                            
                                                            top·work
                    
                                                                                                              
                                                                                                                                  ˈtäp-ˌwərk  
                                                      
                                                          
            
            
              topworked; topworking; topworks            
        
    
                                
              
          
                                                      : to graft scions of another variety on the main branches of (a fruit tree) usually to obtain more desirable fruit                                      
                
                    
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  Merriam-Webster unabridged




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