
A dark horse
Surprise Element
Refers to someone having unexpected talents or abilities.

He turned out to be a dark horse, impressing everyone with his piano skills.
Unassumingly Skilled
Indicates a person who is modest about their skills may have much more to offer.

She didn't boast, but in the competition, she was a dark horse.
Hidden Potential
Implies that someone's true ability has not been revealed yet.

With his innovative ideas, Mark was definitely a dark horse in the company.
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