The phrase "calls shot" refers to a confident prediction or declaration of intent. Antonyms (words with opposite meanings) for this phrase could include phrases such as "uncertain," "hesitant," or "undecided." Alternatively, antonyms might focus on the lack of declaration or prediction, such as "silent," "quiet," or "reserved." In some cases, "calls shot" could be contrasted with phrases that indicate either a lack of confidence or a lack of success, such as "misses the mark," "fails to achieve," or "unsuccessful." Depending on the context in which the phrase is used, many antonyms may be appropriate.