The phrase "am one's tail" generally means to follow or trail closely behind someone. To describe the opposite action, we can use antonyms like lead, guide, or direct. Instead of being the one following, a person could be leading or guiding someone else. Other synonyms for leading include directing, showing the way, and taking charge. It is important to know the antonyms for a certain word to expand one's vocabulary and communication skills. In this case, using antonyms can help one express the opposite action or concept of following closely behind someone.