Definition: A wager or bet; having action means having a bet. In baseball, action has a special meaning: It means the bet counts even if there is a change in starting pitchers. If there is a pitching change accompanied by an odds change, the bettor with action gets the new odds.
Example: Joe has action on the Clippers game.
Pregame.com offers the Sports Gambling Glossary to give you a better understanding of sports betting terms and definitions so you can bet with confidence.