A gentle slope, or a smooth, gently sloping bank; especially (Fort.), that slope of earth which inclines from the covered way toward the exterior ground or country (see Illust. of Ravelin).
1) Smooth stone incline used as a defense; 2) On a fort the sloped earthwork out from the covered way to provide for grazing fire from the forts main walls.
A broad, gently sloped earthwork or natural slope in front of a fort, separated from the fort proper by a ditch and outworks and so arranged as to be swept with musket or cannon fire.