unfriend
verb
                                                                                                                            
                                                            un·friend
                    
                                                                                                              
                                                                                                                                  ˌən-ˈfrend 
                                                      
                                                          
            
            
              unfriended; unfriending; unfriends            
        
    
                                
              
          
                                                      : to remove (someone) from a list of designated friends on a person's social networking website                                      
                
                    
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  Merriam-Webster unabridged




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