Betting Glossary Commercial content | New Customers Only | 18+ This betting glossary provides brief definitions for the most common betting terms. The terms are relevant for sports betting in general or specific to individual sports like football and horse racing. This betting glossary is a good guide to individuals who are new to placing wagers on sport. It covers the most important definitions related to betting. Betting Glossary Terms: All Terms from A-Z Accumulator A single line multiple bet with four selections or more and all selections must win for a winning bet.