Humble Winner. Someone who is better poised to win than obvious candidates but no can tell due to their down to earth and nonchalant mannerism. Someone who doesn't like to brag and boast or outshine others, even when superior than others.
He is the dark horse who stays cool and humble. He has quite confidence of the genius who doesn't need to flaunt his effortless brilliance.
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Not the main favored candidate. Someone somewhat unkown who exceeds expectations of all others in an event. This saying is said to go back to the Victorian politician Benjamin Disraeli who, apart from finding time to regularly become Prime Minister, also found time to write a novel called "The Young Duke". In the book there is a description of a horse race in which the two favourites cannot make the running. In the meanwhile "a dark horse...rushed past the grandstand in a sweeping triumph".
Georgia Tech was a dark horse in the 2004 NCA basketball tournament.
by King May 7, 2005
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A mysterious or shy person who unexpectedly turns out to be the best at something.

Popularly used to describe a man who may not initially catch a lady’s attention but is then unpredictably, completely charming (and, if the lady really hits the jackpot, is fantastic in bed). Due to the element of surprise, a dark horse can often beguile even the most beautiful and intelligent ladies into bed.
‘You got Lizzie into bed? Damn, you’re a dark horse man. We’ve all been trying for months’
by MJ79 March 7, 2006
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a person or team that is no likely to win but may do so anyway
A dark horse like that could have dealt a major blow to your credibility.
by The Return of Light Joker April 18, 2010
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1. A hit song by Katy Perry
2. Someone supposed to bring about the apocalypse
3. Someone who is unnoticed but shocks everyone with a great performance.
When he won at Watkins Glen, AJ Allmendinger went from dark horse to recognized road course specialist.
by fajlkg sdfjkldfs ;jksaj djdfk; November 10, 2014
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To Dark-Horse (verb)

To act in a sly or secretive manner, rarely letting others know what you're doing, where you're going, or who you're going with.

Being a very shady character, and being quite quiet are essential to perfecting this action.

A good poker-face is obligatory, of course.
I saw Ryan buy 4 different cards for Valentines Day, he is such a Dark-Horse, i never know what he's up to.
by Herr Gilbert February 14, 2012
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One who keeps himself or his aims hidden. Keeping things secret, or concealed even seemingly pointless secrets they can be referred to as a dark horse when the interest, relationship, or action is revealed. Perhaps surprising, unexpected, even vaguely scandalous.
"Did you hear Dick won a mountain biking race?"
"Wow! What a dark horse, I thought he was a couch potato!!!"
"Trent has a new hot younger girlfriend, they were keeping it secret because he's her dad's friend"
"What a dark horse!!!"
by Ms Marple September 16, 2021
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