When someone "absent oneself," they leave or go away from a particular place or situation. Antonyms for this phrase include "arrive," "present oneself," "attend," "stay," and "remain." Arriving or presenting oneself would be the opposite of absenting oneself, as it suggests being present in a particular place or situation. Attending also implies being present or participating in something, while staying and remaining suggest not leaving a particular place or situation. These antonyms can be used in different contexts, such as work, school, or social gatherings, where being present or absent can make a difference in one's performance, engagement, or relationships.