"Bring down on" is a phrasal verb that refers to causing someone or something to experience a negative consequence or outcome. Antonyms for this phrasal verb could include terms like elevate, uplift, or exalt, which all suggest causing someone or something to experience a positive consequence or outcome. Other potential antonyms might include terms like support, defend, or protect, which imply helping someone or something avoid negative consequences rather than causing them. Ultimately, the choice of antonym will depend on the context and intent of the sentence, as well as the specific meaning suggested by the speaker or writer.