Examples
“One potential monster of a racehorse is a draw in itself, but two in the same race is unmissable.”
The Guardian: Dewhurst duel between Frankel and Dream Ahead 'best ever' juvenile race
“Among the birds we generally shot, was the painted goose, whose plumage is variegated with the most lively colours; and a bird much larger than a goose, which we called the racehorse, from the velocity with which it moved upon the surface of the water, in a sort of half-flying half - running motion.”
“The most famous Triple Crown winner in racehorse history becomes a movie star this weekend with the release of Disney's "Secretariat," the story of the thoroughbred, his owner Penny Chenery (Diane Lane) and how they managed to set records in 1975 that haven't been matched since.”
The Washington Post: 'Secretariat': Talking with director Randall Wallace about his horse story
“One of the surprises of the new Disney film, "Secretariat," starring Diane Lane as Penny Chenery, the owner of the legendary Thoroughbred racehorse, is a particularly humorous performance by John Malkovich.”
“Dad says they are called racehorse monitors because they can run so fast, and that he once knew a pet one called Phar Lap.”
“Owning a racehorse is an exhilarating, rewarding pursuit if you know how to play the game.”
“The man at the other end would be Prince Ahmed bin Salman bin Abdul Aziz, a Westernized nephew of King Fahd's and a publisher better known as a racehorse owner.”
“They were nearly all in Germany, and as Loricroft is internationally known as a racehorse trainer, there is nowhere in the world more suitable or less conspicuous for him to trade and exchange information than on racecourses. ”
Second Wind
“For one year, 1954, he ran player personnel for the Baltimore Colts of the NFL, then returned to the college ranks at The Citadel, where he introduced an early no-huddle offense called racehorse football, and at the University of Southern California.”
“Kinda like a case of a donkey calling a racehorse a jackass, ain't it?”
Lists
These user-created lists contain the word ‘racehorse’.
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Derby Day!
List of terms one could expect to hear or read in connection with the Kentucky Derby, or high-stakes horse racing in general. This is an open list.
morning line, filly, field, post, favorite, two-year-old, colt, three-year-old, lifetime starts, trained, trainer, owner and 89 more...
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Pinochle
List of terms used in the card game pinochle, beginning with meld and trick.
meld, trick, widow, widow's hand, talon, kitty, trump, trump suit, bid, contract, run, marriage and 63 more...

chained_bear "...if Dan Patch ever lost—and every trainer will tell you that if your horse keeps racing, he will lose (stuff happens: ankles twist; horses drop dead in front of you; shoes fly off; protesting suffragettes swarm onto the track; you just never know)—he would perforce no longer be 'The Undefeated Dan Patch'..."
—Charles Leerhsen, Crazy Good: The True Story of Dan Patch (New York: Simon & Schuster, 2008), 253 Oct 27, 2008
chained_bear The H.M.S. Racehorse was listed as a "transport" captured at Yorktown in 1781. Oct 29, 2007