Meaning of “dark horse” in the English Dictionary

"dark horse" in American English

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dark horsenoun [ C ]

/ˈdɑrk ˌhɔrs/ infml

a person who is not expected to succeed in or unexpectedly wins an election, race, or other competition:

a dark horse in the primaries

(Definition of “dark horse” from the Cambridge Academic Content Dictionary © Cambridge University Press)