The term 'SIDEWALK EDGE' can be broken down into two words, 'SIDEWALK' and 'EDGE'. The word 'CURB' is a four-letter solution to the crossword puzzle and is related to the term 'SIDEWALK EDGE'. A CURB is a raised EDGE that separates a SIDEWALK from a street or other area. It is usually made of concrete or stone and is designed to prevent vehicles from entering the SIDEWALK. Curbs also provide a barrier between pedestrians and traffic, helping to keep people safe.