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                        1
                           general:: 
                           Phrase(s): *a thing or two (about someone or something)  1. bits of information or criticism about someone or something; a few facts about someone or something. (*Typically: find out ~; know ~; learn ~; tell someone ~.)  •  I told Bob a thing or two about cars.  •  I know a thing or two about Mary that would really shock you. 2. a few points of criticism about someone or something. (*Typically: tell someone ~.)  •  I told her a thing or two about her precious little boy!  •  Let me tell you a thing or two about your messy yard!
                           
                           
                           
                           
                        
    
                       
                    
                        
                        
                        
                    
 
                    
                        McGrawhill's American Idioms And Phrasal Verbs
                    
                    
                    
                        2
                           general:: 
                           Quite a lot, as in You can count on Bob to tell you a thing or two about Iran. This term is nearly always an understatement. [Mid-1800s]  Also see  under KNOW ALL THE ANSWERS.
                           
                           
                           
                           
                        
    
                       
                    
                        
                        
                        
                    
 
                    
                        American Heritage Idioms