When we say that something "has pegged," we mean that it has reached a certain level or maximum limit. There are various synonyms for this phrase, including "reached," "hit," "attained," "achieved," "reached its peak," "maximized," "capped," "topped out," "peaked," "flattened out," and "plateaued." All of these terms convey the idea that something has reached its highest point or maximum potential, and is unlikely to go any further. It's important to have a variety of synonyms in our vocabulary to express ourselves effectively, while avoiding overusing the same phrases repeatedly.