Definitions for dark horse
Random House Webster's College Dictionary
dark′ horse′(n.)
a competitor that is relatively unknown or that wins unexpectedly.
Category: Sport
a candidate who is unexpectedly nominated at a political convention.
Category: Government
Origin of dark horse:
1825–35
Princeton's WordNet
dark horse(noun)
a political candidate who is not well known but could win unexpectedly
dark horse(noun)
a racehorse about which little is known
Wiktionary
dark horse(Noun)
A candidate who is nominated unexpectedly, without previously having been discussed or considered as a likely choice.
dark horse(Noun)
An unexpected success.
Origin: Originally an allusion to an unknown horse winning a race, as used in an 1831 novel The Young Duke by Benjamin Disraeli.
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"dark horse." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/dark horse>.