The Collaborative International Dictionary of English v.0.48:

Scarp \Scarp\, n. [OF. escharpe. See 2d Scarf.] (Her.)
   A band in the same position as the bend sinister, but only
   half as broad as the latter.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scarp \Scarp\, n. [Aphetic form of Escarp.]
   1. (Fort.) The slope of the ditch nearest the parapet; the
      escarp.
      [1913 Webster]

   2. A steep descent or declivity.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Scarp \Scarp\, v. t. [imp. & p. p. Scarped; p. pr. & vb. n.
   Scarping.]
   To cut down perpendicularly, or nearly so; as, to scarp the
   face of a ditch or a rock.
   [1913 Webster]

         From scarped cliff and quarried stone.   --Tennyson.
   [1913 Webster]

         Sweep ruins from the scarped mountain.   --Emerson.
   [1913 Webster]

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]

WordNet (r) 3.0 (2006):

scarp
    n 1: a long steep slope or cliff at the edge of a plateau or
         ridge; usually formed by erosion [syn: escarpment,
         scarp]
    2: a steep artificial slope in front of a fortification [syn:
       escarpment, escarp, scarp, protective embankment]

Moby Thesaurus II by Grady Ward, 1.0:

88 Moby Thesaurus words for "scarp":
   abatis, advanced work, balistraria, bank, banquette,
   barbed-wire entanglement, barbican, barricade, barrier, bartizan,
   bastion, battlement, bevel, bezel, bluff, breastwork, bulwark,
   casemate, cheval-de-frise, chute, circumvallation, cliff,
   contravallation, counterscarp, crag, curtain, demibastion, dike,
   drawbridge, earthwork, easy slope, enclosure, entanglement, escarp,
   escarpment, face, fence, fieldwork, fleam, fortalice,
   fortification, gentle slope, glacis, grade, gradient,
   hanging gardens, helicline, hillside, inclination, incline,
   inclined plane, launching ramp, loophole, lunette, machicolation,
   mantelet, merlon, mound, outwork, palisade, palisades, parados,
   parapet, pitch, portcullis, postern gate, precipice, ramp, rampart,
   ravelin, redan, redoubt, sally port, scar, sconce, shelving beach,
   side, slope, steep, steep slope, stiff climb, stockade, talus,
   tenaille, vallation, vallum, wall, work