The Collaborative International Dictionary of English v.0.48:

Escarp \Es*carp"\, n. [F. escarpe (cf. Sp. escarpa, It. scarpa),
   fr. escarper to cut steep, cut to a slope, prob. of German
   origin: cf. G. scharf sharp,, E. sharp, or perh. scrape.]
   (Fort.)
   The side of the ditch next the parapet; -- same as scarp,
   and opposed to counterscarp.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Escarp \Es*carp"\, v. t. [imp. & p. p. Escarped; p. pr. & vb.
   n. Escarping.] (Mil.)
   To make into, or furnish with, a steep slope, like that of a
   scrap. --Carleton.
   [1913 Webster]

WordNet (r) 3.0 (2006):

escarp
    n 1: a steep artificial slope in front of a fortification [syn:
         escarpment, escarp, scarp, protective embankment]