"If it Ain't Broke...Well, What is it Then?"
"In the Thoroughbred world, the terminology gets turned around. Something that is broke is actually ready to do something constructive, while those things that are unbroke are sent back to the factory for some warranty work. Yearlings are an obvious example of such nationwide recalls.
Where the term broke actually came from is a subject of wide debate. Originally it was thought that breaking a horse involved some sort of religious encounter in which the horse's natural wild spirit was traded in on a saddle, or some other object of equal worth. Other authorities tend to think the term was invented by a drunken, dyslexic Australian...."