wake-up call
noun
1
                    
                                          
              
          
                                                      : something (such as a telephone call from a hotel employee to a guest) that serves to wake a sleeper                                      
                
                    
2
                    
                                          
              
          
                                                      : something that serves to alert a person to a problem, danger, or need                                      
              
                             
a wake-up call to parents
                         
                
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  Merriam-Webster unabridged




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