The phrase "setting to" refers to starting or beginning to do something. Its antonyms would include words like stopping, quitting, ending, ceasing, or retiring from a task or activity. Other antonyms could include procrastinating, delaying, postponing, or avoiding altogether. Depending on the context and the nature of the activity, there may be more specific or nuanced antonyms as well. For example, if the activity is physical, antonyms could include resting or relaxing, while for mental tasks, antonyms like diverting or distracting may be more appropriate. Ultimately, the antonyms for "setting to" depend on the situation and what the opposite action would be in that particular context.