kerb : (BrE) (NAmE curb) = pavement = sidewalk the edge of the raised path at the side of a road, usually made of long pieces of stone: e.g. The bus mounted the kerb (= went onto the pavement / sidewalk) and hit a tree. edge: at the end of the road

The kerb is the edge of the pavement were pedestrians walk, it its almost always elevated a couple inches above the road, hence why a car may hit it. An edge, is just the perimeter of something, very generic. To park on the edge of the road is to park beside the pavement ( or kerb ) but not on top of it.

Hi good to see you back on line again Safaa.This is an excellent online dictionary which will help you with your question and others you might have in future: www.thefreedictionary.com