Dark Horse Idiom Meanings, Definition and Origins Hidden Origins The idiom “dark horse” comes from horse racing. In that context, a “dark” horse was one that was not well known to the public or the betting community. Because little was known about the horse’s past performance, it was difficult to predict how it would perform in a race. The term later moved from the racetrack into everyday language. Core Meaning In modern usage, a “dark horse” refers to a person who unexpectedly succeeds or wins,

Definition of candidate key

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