Antonyms for the phrase "go bat for" include "oppose," "condemn," "criticize," and "abandon." While "go bat for" implies support or advocacy, these antonyms convey a sense of disagreement, disapproval or rejection. When one opposes someone else's cause or viewpoint, it can create a sense of tension or conflict between them. By criticizing or condemning someone, one may spark negative emotions in the person being targeted or in others who agree with them. Abandoning someone or something can create isolation and feelings of betrayal. Therefore, it is important to consider these antonyms carefully when choosing language that accurately reflects one's intentions and values.