The phrase "calling shot" refers to a deliberate and precise prediction of one's actions, often in sports or games. The antonyms for this expression would be "improvisation," "spontaneity," or "unpredictability." These terms suggest that an individual is making decisions on the fly, without a preconceived plan, and reacting to situations as they arise. While "calling shots" may indicate a high level of skill and confidence, the absence of a clear plan can add excitement and suspense to a game or competition. In some cases, "calling shots" can also lead to arrogance or error, whereas spontaneous decision-making may result in unexpected successes.