"Runs circles" is a phrase that refers to someone who is overly dominant or confident in a situation, to the point of appearing arrogant or controlling. Synonyms for this phrase include "takes over," "calls the shots," "dominates," "is in charge," "rules the roost," "exerts control," "dictates," "wields power," and "holds sway." These terms all emphasize the idea of someone who is exerting their influence in a way that can be overbearing or intimidating to others. Depending on the context, these synonyms can help convey a specific tone or attitude, such as assertiveness, bossiness, or even aggression.