The antonyms for the phrase "centering up on" vary depending on the context. If it refers to focusing or concentrating on a particular subject or topic, the antonyms could be diverging, getting sidetracked, or losing focus. If it indicates the process of aligning an object or person with a fixed center point, the antonyms could be misaligning, shifting off-center, or shifting out of position. In terms of emotional or mental balance, the antonyms may include wobbling, swaying, or losing stability. Overall, the antonyms for "centering up on" bring out the opposite meaning of the phrase, signifying a lack of focus, alignment, or balance.