The phrase "buries the hatchet" refers to reconciling with someone or ending a conflict. However, there are several antonyms to this phrase that connote the opposite of burying the hatchet. One antonym is "nurturing a grudge," implying that one is holding onto negative feelings and resentment. Another antonym is "creating more conflict," where one continues to engage in actions or behaviors that exacerbate a situation instead of seeking a resolution. Lastly, "walking away" can also be an antonym to "burying the hatchet," meaning that one decides to end the relationship or situation without attempting to reconcile or resolve the issue.