The term INSTALL, AS A SIDEWALK can be solved by the four-letter word PAVE. Paving is a process of laying down a hard surface, such as asphalt or concrete, to create a sidewalk. This process involves excavating the area, laying down a base layer, and then adding the pavement material. The pavement material is then compacted and leveled to create a smooth, even surface. Paving is often used to create sidewalks, driveways, and parking lots.