Definition

1. Noun:
   • A racehorse about which little is known: A competitor in a horse race whose abilities or form are largely unknown to the public or bettors, making its chances of winning difficult to predict.
   • A political candidate who is not well known but could win unexpectedly: A person who enters a competition, especially an election, with little public recognition or expectation of success, yet who may achieve a surprising victory.

Usage Examples

• Noun:
  • The Derby winner was a complete dark horse; no one had even heard of him before the race.
  • In the mayoral election, a dark horse candidate emerged from the debates and gained significant support.

Advanced Usage

• The term can be extended to any contestant or entrant in a competition who is relatively unknown but has the potential to succeed.
  • The new startup is a dark horse in the tech industry, but their innovation could disrupt the market.
• It can describe a person with hidden talents or qualities that are not immediately apparent.
  • Everyone thought he was just a quiet accountant, but he turned out to be a dark horse with incredible artistic talent.

Variants and Related Words

• Underdog (n): A competitor thought to have little chance of winning. (Note: An "underdog" is typically known to be at a disadvantage, while a "dark horse" is simply unknown.)
• Sleeper (n): Something that achieves unexpected success after a period of obscurity. (Often used for films, books, or stocks.)

Synonyms

• Unknown quantity: A person or thing whose nature, value, or significance is not known.
• Long shot: A competitor, entry, or candidate with only a slight chance of winning.
• Cinderella: A person or team that achieves unexpected success, often from a humble position. (More common in sports contexts.)

Related Idioms

• To come out of nowhere: To appear or achieve success suddenly and unexpectedly.
  • The young singer came out of nowhere to win the competition.
• A bolt from the blue: A complete surprise.
  • His victory was a bolt from the blue for the political establishment.

Noun

1. a racehorse about which little is known
2. a political candidate who is not well known but could win unexpectedly