troubleshooter
noun
                                                                                                                            
                                                            trou·ble·shoot·er
                    
                                                                                                              
                                                                                                                                  ˈtrə-bəl-ˌshü-tər  
                                                      
                                                          
            1
                    
                                          
              
          
                                                      : a skilled worker employed to locate trouble and make repairs in machinery and technical equipment                                      
                
                    
2
                    
                                          
              
          
                                                      : an expert in resolving diplomatic or political disputes : a mediator of disputes that are at an impasse                                      
                
                    
3
                    
                                          
              
          
                                                      : a person skilled at solving or anticipating problems or difficulties                                      
                
                    
Love words? Need even more definitions?
  
  Merriam-Webster unabridged




Share