Tabular bodies of stone or concrete, straight or curved, that are set on edge and form the upward vertical projection bordering streets, sidewalks, or planted areas.

an edge between a sidewalk and a roadway consisting of a line of curbstones (usually forming part of a gutter)

Slabs and blocks of stone bordering streets, walks, etc.

Entering a meter reading without viewing the meter dials (from entering reads while sitting at the curb).