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                           general:: 
                           Phrase(s): You don’t know the half of it.  Inf. You really don’t know how bad it is.; You might think that what you have heard is bad, but you do not know the whole story.  •  Mary: They say you’ve been having a bad time at home. Sally: You don’t know the half of it.  •  Sally: The company has no cash, they are losing orders right and left, and the comptroller is cooking the books. Mary: Sounds bad. Sally: You don’t know the half of it.
                           
                           
                           
                           
                        
    
                       
                    
                        
                        
                        
                    
 
                    
                        McGrawhill's American Idioms And Phrasal Verbs