The term "calls off bets" can be explained as a situation where a bookmaker or gambling entity cancels any money placed on a particular event or outcome. Some antonyms for this term include "confirms bets," "validates wagers," or "accepts bets." In these instances, the bookmaker allows the bets to stand and takes any potential losses or gains associated with the bet. Other antonyms could include "rejects bets" or "denies wagers," indicating that the gambling entity has deemed the wager as invalid or against their policies. It is important for bettors to have a clear understanding of the bookmaker's policy on bets and cancellations to avoid any confusion or disappointment.