The phrase "be on back of" can be interpreted in a few different ways depending on the context, but some possible antonyms for the general idea of pressuring or nagging someone could be "let go of," "give space to," or "stop bothering." On the other hand, if the meaning is more specifically to do with supervision or management, antonyms might include "delegate," "trust," or "empower." It's important to consider the specific situation and goal when seeking out antonyms for a word or phrase to ensure the chosen words accurately convey the intended message.