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                           general:: 
                           Phrase(s): *one’s own worst enemy  Fig. consistently causing oneself to fail; more harmful to oneself than other people are. (*Typically: be ~; become ~.)  •  Ellen: My boss is my enemy. She never says anything good about me. Jane: Ellen, you’re your own worst enemy. If you did your job responsibly, your boss would be nicer.
                           
                           
                           
                           
                        
    
                       
                    
                        
                        
                        
                    
 
                    
                        McGrawhill's American Idioms And Phrasal Verbs