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English definition of “dark horse”

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dark horse

noun [C usually singular] uk   us  

dark horse noun [C usually singular] (SECRET)

UK a person who keeps their interests and ideas secret, especially someone who has a surprising ability or skill: Anna's such a dark horse - I had no idea she'd published a novel.

dark horse noun [C usually singular] (WINNER)

US a horse or a politician who wins a race or competition although no one expected them to
(Definition of dark horse from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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