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- Jackpot: Monies carried over to the next suitable race or meeting. This occurs in exotic bet types such as quadrella and superfecta when no investor selects the winning combination.
- Jigger: An illegal battery powered device used by a jockey to stimulate a horse during a race or track work.
- Jumped out of the ground: Said of a horse which comes from nowhere at the end of the race.
- Jumped out of trees: Said by bookmakers of a rush of punters to plunge on a horse.
- Just about square: Punters expression for nearly broke.
Read more about this topic: Glossary Of Australian And New Zealand Punting