eye-opener
noun
                                                                                                                            
                                                            eye-open·er
                    
                                                                                                              
                                                                                                                                  ˈī-ˌō-pə-nər  
                                                                                                                              
            -ˌōp-nər
                                                      
                                                          1
                    
                                          
              
          
                                                      : a drink intended to wake one up                                      
                
                    
2
                    
                                          
              
          
                                                      : something startling, surprising, or enlightening                                      
              
                             
her biography is a real eye-opener
                         
                
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  Merriam-Webster unabridged




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