Definitions
There are 2 meanings of the phrase
Dark Horse.
Dark Horse - as a noun
A political candidate who is not well known but could win unexpectedly
A racehorse about which little is known
Example Sentences
"The dark horse in the competition surprised everyone by winning first place."
"She is a dark horse in the art world, with an extraordinary talent that nobody expected."
"The underdog team turned out to be the dark horse of the tournament."
"He may seem quiet and unassuming, but he is actually a dark horse with a lot of hidden skills."
"The dark horse candidate emerged as the surprising favorite in the election."