The phrase "stood behind" usually implies a person's support or loyalty. As such, antonyms for this phrase may include words that suggest disapproval or opposition. Words like "oppose," "resist," or "undermine" may convey this sense of dissent. Additionally, words like "abandon," "betray," and "disown" suggest a lack of support or loyalty. However, the sense of the phrase may also depend on the context in which it appears. For instance, "stood in front of" could serve as an antonym if the phrase refers to a physical location rather than a figurative stance.