Bring up on has no clear antonyms, as it is a phrasal verb with a unique definition. However, there are antonyms for the individual words within the phrase. Bring can be antonymous with take or leave, depending on the context. For example, if you are bringing something to a location, then taking it away from that location would be considered its antonym. Up can have antonyms such as down or under, depending on the context. Together, bring up on means to raise a topic or suggest something for discussion, and there are no direct antonyms for this specific definition.