dark horse definition urban dictionary
dark horse. n. 1. One who achieves unexpected support and success as a political candidate, typically during a party's convention. 2. A little-known, unexpectedly successful entrant, as in a horserace. dark horse. n.
Dark horse. For other uses, see Dark Horse (disambiguation). A dark horse is a little-known person or thing that emerges to prominence, especially in a competition of some sort, or a contestant that seems unlikely to succeed. The term began as horse racing parlance for a race horse that is unknown to gamblers and thus difficult to place betting odds on.