"Be one's tail" is an expression that means to closely follow or constantly accompany someone. Some antonyms for this phrase could be:
1. Lead the way - This means to guide or show someone the way, taking charge rather than following.
2. Break away - This describes the act of separating or disconnecting oneself from the person they were previously following.
3. Wander off - This means to leave someone's side without any particular destination or goal in mind.
4. Branch out - This means to explore new opportunities or ventures, moving away from the individual they were previously shadowing.
Using these antonyms can help convey a sense of independence, individuality, and adventure, rather than simply being someone's follower.