recrudescence
noun
                                                                                                                            
                                                            re·cru·des·cence
                    
                                                                                                              
                                                                                                                                  ˌrē-krü-ˈde-sᵊn(t)s 
                                                      
                                                          
            
                                
              
          
                                                      : a new outbreak after a period of abatement or inactivity : renewal                                      
              
                             
a recrudescence of the symptoms
                                       a recrudescence of guerrilla warfare
                         
                
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  Merriam-Webster unabridged




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