"At curb" is a commonly used phrase that denotes an object or individual being positioned along the edge of a street or road. Other synonyms that can be used instead of "at curb" include "adjacent to the pavement", "on the roadside", "along the street", "by the sidewalk", "beside the curb", "at the edge of the road" and "next to the curb". These synonyms can be useful in various contexts such as giving directions, describing parking locations or indicating where to leave or pick up items. Substituting "at curb" with any of these synonyms can add variety to your language and make your communication more effective.