Antonyms, or words that have opposite meanings, for the phrase "was tail" could include "was head," "was front," or "was leader." These antonyms imply that the subject, whether it be a person or animal, is in a position of authority or at the forefront of a group. The opposite of being "tail" suggests a sense of direction and control, as well as a willingness to take on responsibility. While "was tail" may imply trailing behind or following the pack, its antonyms suggest a more assertive and commanding presence. By using antonyms, we can better understand the nuances of language and how our choice of words can shape meaning.