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Many people will say that it originated with a horse named 'Upset' defeating the heavily favored and previously unbeaten Man o' War in 1919, but that is a myth.

The word upset, meaning to overturn or topple, has been in the English lexicon for hundreds of years, often being used when referring to toppling kings, or more colloquially, apple carts.

It has been used to denote as sports underdog defeating a heavily favored opponent as far back as 1877, but the idea is much older than that...

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12y ago

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