Adjective
antepost (not comparable)
(gambling) Being a kind of bet, in horse-racing and greyhound racing, placed before the racecourse's betting market has opened, on the expectation that the price of the animal is presently more favourable than it will be when the market opens.
Antepost Angle: Investec Oaks - 2pts win Contingent in Investec Oaks at 20/1 (General). Source: Internet