"Calling the shot" is an idiomatic expression that means to make a bold prediction or decision about the future. Some antonyms for this phrase could be "uncertain," "undecided," or "hesitant." These words denote a more cautious approach to decision-making, one that doesn't involve making bold statements or predictions. Other antonyms might include "reticent," "guarded," or "measured." These words suggest a level of reserve or caution when it comes to making predictions or taking actions that could have major consequences. Overall, there are many different ways to express an opposite of "calling the shot," depending on the context and the speaker's intention.