es·carp·ment /ɪˈskɑrpmənt/
  懸崖,斷崖,絕壁
  Es·carp·ment n.  A steep descent or declivity; steep face or edge of a ridge; ground about a fortified place, cut away nearly vertically to prevent hostile approach. See Scarp.
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  escarpment
       n 1: a long steep slope or cliff at the edge of a plateau or
            ridge; usually formed by erosion [syn: scarp]
       2: a steep artificial slope in front of a fortification [syn: escarp,
           scarp, protective embankment]