Bobble/Stumble

A slip or a duck from a horse trying to leave the starting gates, often caused by the surface giving way under the feet. This can range from a mild misstep to a stumble down to their knees.

Handicap

A race where a handicapper has assigned weights to be carried by all runners on the basis of their past racing efforts.

Daily Double

A wager on two consecutive races on the card where bettors have to pick both winners.