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Longman Dictionary of Contemporary English
horse show
noun
EXAMPLES FROM CORPUS
▪ During a horse show he positioned himself at the edge of the arena.
▪ If you visit any horse show you will see plenty of freeze branded winners.
▪ It was a mixture of agricultural show, horse show, trade exhibition, Highland Games and garden fete.
▪ The keenness of the Horse Rangers is particularly evident during the build-up to their annual horse show.
▪ Visitors to the camp and the boys themselves endured cleansing rituals, and campers stayed away from the local annual horse show.
▪ We entered the very horse show that we had to sit out the year before.
The Collaborative International Dictionary
horse show

horseshow \horse"show`\, horse show \horse" show`\n. a competitive exhibition of horses.

Wikipedia
Horse show

A horse show is a judged exhibition of horses and ponies. Many different horse breeds and equestrian disciplines hold competitions worldwide, from local to the international levels. Most horse shows run from one to three days, sometimes longer for major, all-breed events or national and international championships in a given discipline or breed. Most shows consist of a series of different performances, called classes, wherein a group of horses with similar training or characteristics compete against one another for awards and, often, prize money.

Usage examples of "horse show".

Burrich had warned me that some dishonest horse traders fed their charges carris oil on their grain, for the purpose of winning a race, or to make a sick horse show well at an auction.