Outside of an episode of the 1960s sitcom Mister Ed, there’s no such thing as a talking horse. But reality rarely gets in the way of a good idiom. Take “straight from the horse’s mouth,” a phrase referring to information derived from a reputable source. The origins of this saying are uncertain, but there are two theories worth discussing.
One possible origin story has to do with the world of horse betting. An early citation of the idiom from 1861 appeared in an advertisement for a racetrack: “A raker to win, straight from the horse’s mouth, and two steamers for places.” That might make sense to a 19th-century bettor, but it doesn’t clear up the origin story for us. The phrasing came closer to its modern meaning by the time it appeared in a 1910 article on the topic of horse racing in the Daily Herald of Adelaide, Australia. The article noted that some gamblers got beneficial information “straight from the horse’s mouth.” In other words, trainers, jockeys, and other stable workers would pass along sensitive info about the horses that wasn’t publicly available, making it seem as if it came from the horse itself. Well-connected bettors had an insider advantage.
Another theory posited by the language blog Grammarphobia suggests the phrase may be derived from the world of horse trading, not betting. It’s based on the idea that horse sellers would try to conceal information about their horse’s health in order to close a deal. To prevent being scammed, potential buyers examined the horse’s mouth and teeth in order to glean a more truthful analysis about its health than the seller was willing to provide. But these are just theories, and we can’t pinpoint which one (if either) is reputable enough to have come from the horse’s mouth.
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