Source : Webster's Revised Unabridged Dictionary (1913)

Slope \Slope\, v. t. [imp. & p. p. {Sloped}; p. pr. & vb. n.
   {Sloping}.]
   To form with a slope; to give an oblique or slanting
   direction to; to direct obliquely; to incline; to slant; as,
   to slope the ground in a garden; to slope a piece of cloth in
   cutting a garment.

Sloping \Slop"ing\, a.
   Inclining or inclined from the plane of the horizon, or from
   a horizontal or other right line; oblique; declivous;
   slanting. -- {Slop"ing*ly}, adv.

         The sloping land recedes into the clouds. --Cowper.

Source : WordNet®

sloping
     adj 1: having an oblique or slanted direction [syn: {aslant}, {aslope},
             {diagonal}, {slanted}, {slanting}, {sloped}]
     2: having a slanting form or direction; "an area of gently
        sloping hills"; "a room with a sloping ceiling"