Across the Board

Refers to betting on a horse to finish first, second, and third to cover any of those scenarios happening during a race

Superfecta

A wager involving choosing the first, second, third, and fourth horses in one race in the exact order. A superfecta box involves paying more to ensure they can finish in any order in the top four spots.

Overlay

A horse going off at higher odds than his recent efforts show that he deserves.