There are several antonyms for the phrase "a move on," which generally means to take action or make progress. One could say that antonyms for this phrase might include "inaction," "stagnation," or "complacency." Alternatively, one might say that if someone is not making a move on something, they are hesitating or procrastinating. In this case, antonyms could include "determination," "promptness," or "motivation." Ultimately, the best antonym for "a move on" will depend on the context in which the phrase is being used and the specific type of action or progress that is being referred to.