Definitions
1.NounA defensive mound of earth or a wall with a broad top and usually a stone parapet; a wall-like ridge of earth, stones or debris; an embankment for defensive purpose.
2.NounA defensive structure; a protective barrier; a bulwark.
3.NounThat which defends against intrusion from outside; a protection.
4.NounA steep bank of a river or gorge.
5.VerbTo defend with a rampart; fortify or surround with a rampart.