The antonyms for the phrase "calling off bets" include "placing bets", "making wagers", "betting on", "backing", "gambling", and "staking". These antonyms represent the opposite of ending a bet or wager, and instead, suggest actively engaging in betting or gambling activities. Whether it's playing cards or sports betting, those who place bets and make wagers are actively involved in games of chance, often with high stakes. While calling off bets may signal a disappointing end to a game or event, the antonyms for this phrase remind us that there is always the potential for high-risk, high-reward gambling ventures.