The term "up dating" refers to the process of updating or enhancing something. The opposite of up dating would be downgrading or reducing its quality or functionality. Another antonym for up dating would be "neglecting" that means failing to give proper attention or care to something. Some other antonyms may also include "outdating" which implies that something has become obsolete and losing its relevance. Lastly, "sabotaging" could also be considered an antonym for up dating, which is intentionally causing damage or harm to something instead of improving it. Ultimately, antonyms for up dating reflects contrasting actions that lead to diminishing the value or the importance of something.