The phrase "kick one's heels" means to waste time or to be idle due to boredom or lack of things to do. Some antonyms of this phrase include being busy, active, engaged, or occupied. People who are not kicking their heels might be using their time constructively by carrying out tasks, completing projects, or pursuing their hobbies. They might also be enjoying social activities, spending time with loved ones, or participating in physical activities like sports or exercise. Overall, the antonyms of "kick one's heels" indicate a productive, fulfilling, and purposeful use of time rather than being unoccupied and unproductive.
