Longman Dictionary of Contemporary English homepage

dark horse

noun
     
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.
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.

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