the world > animals > mammals > group Ungulata (hoofed) > family Equidae (general equines) > horse defined by purpose used for > [noun] > racehorse > that finishes in particular position > in fixed race (2)
Horse Racing. Of a horse: Held in check so as to cause him to lose the race. Also figurative.
In Horse Racing, a predetermined or ‘fixed’ race, or the winner of it. Hence loosely, a horse which is a certain winner.