Definitions for dark horse
Random House Webster's College Dictionary
a competitor that is relatively unknown or that wins unexpectedly.
a candidate who is unexpectedly nominated at a political convention.
Origin of dark horse:
a political candidate who is not well known but could win unexpectedly
a racehorse about which little is known
A candidate who is nominated unexpectedly, without previously having been discussed or considered as a likely choice.
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.
A dark horse is a little-known person or thing that emerges to prominence, especially in a competition of some sort or a contestant that seems unlikely to succeed.
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