"Smack the middle" means to be right in the center of something. Its antonyms include several phrases like "off to one side," "at the edge," "in the corner," "on the perimeter," and "outside the center." When something is "off to one side," it is not in the middle but rather located away or far from the center. Similarly, something "at the edge" is often found at the boundary or outskirts of an area, rather than at the focal point. When people say something is "in the corner," they mean it is situated in the corners or angles of an area. These antonyms show different positions from the mid-point or center.