The phrase "cool one's heels" is often used to encourage someone to wait patiently or calm down. However, there are various antonyms that can be used to express the opposite meaning. For instance, "jump out of one's skin", "hit the ground running", and "spur of the moment" imply being overly eager or hasty. Similarly, "restless", "impatient" and "ants in one's pants" indicate a lack of composure or the inability to remain calm. Additionally, "hot-headed", "fired up" and "agitated" convey feelings of excitement, anxiety or anger, which are the opposite of being composed and collected while waiting.