backstabbing
noun
                                                                                                                            
                                                            back·stab·bing
                    
                                                                                                              
                                                                                                                                  ˈbak-ˌsta-biŋ  
                                                      
                                                          
            
                                
              
          
                                                      : betrayal (as by a verbal attack against one not present) especially by a false friend                                      
                
                    
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  Merriam-Webster unabridged




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