dark horse
noun
1
                    
        a
    
          
                                          
              
          
                                                      : a usually little known contender (such as a racehorse) that makes an unexpectedly good showing                                      
                
                    
        b
    
          
                                          
              
          
                                                      : an entrant in a contest that is judged unlikely to succeed                                      
                
                    
2
                    
                                          
              
          
                                                      : a political candidate unexpectedly nominated usually as a compromise between factions                                      
                
                    
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  Merriam-Webster unabridged




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