long shot
noun
1
                    
                                          
              
          
                                                      : a venture involving great risk but promising a great reward if successful                                      
                
                                
            also                
          
                                                      : a venture unlikely to succeed                                      
            
            2
                    
                                          
              
          
                                                      : an entry (as in a horse race) given little chance of winning                                      
                
                    
3
                    
                                          
              
          
                                                      : a bet in which the chances of winning are slight but the possible winnings great                                      
                
                    
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  Merriam-Webster unabridged




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