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dark horse [countable]
1 someone who is not well known, and who surprises people by winning a competition : 
In the 1955 golf championship, dark horse Jack Fleck defeated Ben Hogan.
In the 1955 golf championship, dark horse Jack Fleck defeated Ben Hogan.2 British English someone who does not tell people much about themselves, but who has surprising qualities or abilities : She's a dark horse. I didn't know she'd written a novel.
She's a dark horse. I didn't know she'd written a novel.
