Practice
Dark horse: meaning, use, and possible origin
Sign in to saveBefore the final, most people expected Leo or Priya to win. Then Hana gave a strong performance and won the competition. A reporter called Hana a dark horse. The reporter meant that few people had expected her success, not that she was an animal.
Understand dark horse as a figurative description, use it for an unexpected competitor or candidate, and describe its likely racing origin without treating a popular story as certain fact.
Read and practice
Read the examples and try the written questions in this guide. Listening recordings are not available for this lesson yet.
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dark horse /dɑːk hɔːs/
The short answer
A dark horse is an unexpected competitor or candidate with a real chance of doing well. In a race for class representative, a quiet student who suddenly receives strong support may be called a dark horse.
No one had mentioned Malik before the contest, but he became the dark horse after his first presentation.
Why it works: Malik was not widely expected to succeed, but his performance made people take him seriously.
6 more examples
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Aisha was a dark horse in the robotics competition because nobody outside her school had seen her work.
Aisha may perform very well, but she is not yet widely known to the other competitors.
Not this:Aisha was
the favoritein the robotics competition because she had won it twice before. What changes: A favorite is expected to win, while a dark horse is less expected. -
The local team is the dark horse of the league after winning against two stronger teams.
The team has begun to look capable of success even though many people did not expect it.
Not this:The local team is
expected to finish lastbecause several players are injured. What changes: This sentence gives a negative prediction and does not suggest a surprising chance of success. -
Several analysts described Chen as a dark horse in the mayoral election.
Chen is a less expected candidate who may receive more support than people first thought.
Not this:Chen was
the best-known candidateand led every poll before the election. What changes: A leading, well-known candidate is not normally described as a dark horse. -
Keep an eye on Dara; she could be a dark horse in the debate final.
The speaker predicts that Dara may surprise people with a strong result.
Not this:Keep an eye on Dara because she
is organizing the debate schedule. What changes: This gives Dara a task, but it says nothing about her chance of winning. -
The dark horse won the cooking contest after impressing the judges in the final round.
The winner had been overlooked before the final, so the phrase explains why the result surprised people.
Not this:
The expected winnerwon the cooking contest after leading every earlier round. What changes: This outcome matches what people already predicted. -
The rescue center cared for a dark horse that had been found near the road.
Here dark describes the color of a real horse. The phrase is literal, not an idiom.
Not this:The new runner was
a dark horsein the city marathon. What changes: Here dark horse describes an unexpected competitor, so the phrase is figurative.
Read the full guide
Start with expectations. Ask who people expected to win or lead, then look for a less familiar person who might surprise them. If that person has a real possibility of success, dark horse can fit. It does not simply mean any person who wins unexpectedly after the event is over.
Find the unexpected competitor
A dark horse is part of a comparison. First identify the contest or choice. Then find the person, team, or candidate that other people did not expect to do well. The phrase works when that overlooked person still has a believable chance of success.
Mina had not played in a national tournament before, but she was a dark horse in the final.
Mina is less familiar to the public, yet she has reached the final. That combination makes dark horse natural.
Does dark horse mean that Mina is certain to win?
No. It means she may surprise people; the result is still uncertain.
Separate the idiom from a literal horse
Dark horse can also be literal. A real horse may have a dark coat. Look at the rest of the sentence: a stable, a field, or animal care usually points to the literal meaning. A contest, candidate, or possible winner usually points to the idiom.
The veterinarian examined the dark horse before the race.
The sentence concerns an animal, so dark describes the horse's appearance.
The new singer is a dark horse in the television contest.
The contest and the new singer show that dark horse means an unexpected possible winner.
Use it at the right time
People often use dark horse before a result is known: She is a dark horse in the election. They can also use it afterward to explain a surprise: He was the dark horse who won. The phrase needs a setting where people have expectations about success.
Before the interview panel met, Omar was a dark horse for the role.
Omar is an unexpected possible choice while the decision is still open.
Can you call a quiet neighbor a dark horse when there is no competition or decision?
Usually no. The idiom needs a context where someone might succeed or be chosen.
Compare a dark horse with a favorite
A favorite is the person or team that many people expect to win. A dark horse is less expected, often because people know less about them. Both can be skilled. The difference is public expectation, not the amount of talent.
The defending champion was the favorite, but the dark horse won by one point.
The champion had an established reputation. The other competitor surprised people by winning.
The committee chose an unexpected candidate with strong local experience.
This plain-English version is useful when an idiom would be too informal or unclear.
Treat origin stories with care
Dictionary and etymology sources commonly connect the idiom with horse racing. A little-known horse could surprise bettors because its past performance was unknown or not widely noticed. Some accounts also point to an 1831 novel by Benjamin Disraeli as an early famous written example. These details support a likely history, but they do not prove a single moment when every speaker began using the phrase.
The reporter called the newcomer a dark horse because the public had little information about her earlier results.
The example keeps the racing idea of an unknown competitor but applies it to a person.
Is an often-repeated origin story the same as proof that a writer invented the idiom?
No. An early written example can show that the phrase existed by that time, but it may not show its first spoken use.
Before you go
Remember this
Use dark horse for a little-known or overlooked person or team with a credible chance of success. Read the sentence to separate the figurative idiom from a real horse with a dark coat. The phrase is widely connected with horse racing, but a familiar origin story is not proof of the first person who used it.
Practice with the written examples
You can practice with the written questions in the Learn tab. Each answer includes an explanation.
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Try the written questionsQuestions about "Dark horse: meaning, use, and possible origin"
What does dark horse mean in English?
A dark horse is a person, team, or candidate that people do not expect to succeed but that may do very well. The phrase is common when people compare possible winners in a competition, election, or selection process.
Aisha was a dark horse in the robotics competition because nobody outside her school had seen her work.
Is dark horse positive or negative?
Dark horse is usually neutral or positive. It can suggest that someone has ability that others have not noticed. Its tone depends on the situation, so name the person's relevant skills as well when a decision needs clear evidence.
Aisha was the favorite in the robotics competition because she had won it twice before.
What is the difference between a dark horse and a favorite?
A favorite is widely expected to win or be chosen. A dark horse is less expected, often because the public knows less about the person or team. Both may be strong competitors; the difference is the expectation around them.
The local team is the dark horse of the league after winning against two stronger teams.
Can dark horse describe a real horse?
Yes. Dark horse can literally describe a horse with a dark coat. The idiom has a figurative meaning only when the context is about an unexpected competitor, candidate, or possible winner rather than an animal.
The local team is expected to finish last because several players are injured.
Where does the idiom dark horse come from?
The idiom is commonly linked to horse racing, where a little-known horse could surprise bettors. Some accounts cite an early famous written use in an 1831 novel by Benjamin Disraeli. Those accounts show a likely history, but they do not prove who first created the spoken phrase.
Several analysts described Chen as a dark horse in the mayoral election.