"Cooled one's heels" is a phrase used to describe a person waiting impatiently for something or someone. The phrase has many antonyms like 'fast-tracked,' 'prioritized,' 'hastened,' 'sped up,' or 'expedited.' These words all suggest an expedited process of completion or arrival. For example, if someone fast-tracks a process, they make sure it is completed quickly. Prioritizing, on the other hand, suggests that something is given more importance and, thus, completed first. By hastening something, a person ensures that there is no delay, while speeding up suggests that the process is completed in record time. Lastly, expediting a process means to facilitate its completion. Therefore, these antonyms reflect different ways to counter the phrase, "cooled one's heels.