Steep slope in front of a fortification

• Declivity
• Protective embankment
• Steep descent
• Moat wall
• Ditch wall
• Inner wall of a trench
• Steep slope around a rampart
• A steep artificial slope in front of a fortification

Wiktionary Word definitions in Wiktionary
n. The side of the ditch next to the parapet in a fortification; the scarp. vb. (context transitive English) To make into, or furnish with, a steep slope, like that of a scarp.