The term "call the turn" is often used in the context of playing poker, and refers to a player indicating that they intend to bet a certain amount of money on their hand. Antonyms of this phrase could include "fold," which means to give up on one's hand and end their participation in the current round of betting, or "check," which means to pass up the opportunity to bet (either because one does not wish to or because they do not have the funds to do so). Other antonyms could include "raise," which means to add more money to the current bet, or "all-in," which means to bet all of one's remaining chips.