retrocede
verb
                                                                                                                            
                                                            ret·ro·cede
                    
                                                                                                              
                                                                                                                                  ˌre-trō-ˈsēd  
                                                      
                                                          
            
            
              retroceded; retroceding            
        
    
                                
              
          
                                                      : to go back : recede                                      
                
                    
                        
          
[French rétrocéder, from Medieval Latin retrocedere, from Latin retro- + cedere to cede]                                  
              
          
                                                      : to cede back                                      
              
                             
retrocede a territory
                         
                
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  Merriam-Webster unabridged




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