the.com/dark horse

The one nobody bet on, laughing last at the finish line.

means A person who unexpectedly succeeds or reveals hidden talent after being overlooked or underestimated by everyone around them.

from Born on the racetrack, literally — a 'dark horse' was a racehorse whose abilities were unknown to bettors, often because its color made it hard to distinguish or its form was simply undocumented, so nobody could handicap it. The phrase galloped into politics in the 1800s, famously applied to surprise, little-known candidates who emerged to win nominations over favored frontrunners. From there it spread into everyday use for any quiet underdog who upends expectations.

origin
19th century horse racing, unknown bloodline, unpredictable odds
first big use
Benjamin Disraeli novel popularized the political sense
modern habitat
elections, talent shows, underdog Oscar picks
key trait
wins precisely because everyone underestimated it
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