The Collaborative International Dictionary of English v.0.48:

Slope \Slope\, adv.
   In a sloping manner. [Obs.] --Milton.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Slope \Slope\, v. i.
   1. To take an oblique direction; to be at an angle with the
      plane of the horizon; to incline; as, the ground slopes.
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   2. To depart; to disappear suddenly. [Slang]
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The Collaborative International Dictionary of English v.0.48:

Slope \Slope\, n. [Formed (like abode fr. abide) from OE.
   slipen. See Slip, v. i.]
   1. An oblique direction; a line or direction including from a
      horizontal line or direction; also, sometimes, an
      inclination, as of one line or surface to another.
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   2. Any ground whose surface forms an angle with the plane of
      the horizon.
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            buildings the summit and slope of a hill.
                                                  --Macaulay.
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            Under the slopes of Pisgah.           --Deut. iv.
                                                  49. (Rev.
                                                  Ver.).
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   3. The part of a continent descending toward, and draining
      to, a particular ocean; as, the Pacific slope.
      [Webster 1913 Suppl.]

   Note: A slope, considered as descending, is a declivity;
         considered as ascending, an acclivity.
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   Slope of a plane (Geom.), the direction of the plane; as,
      parallel planes have the same slope.
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The Collaborative International Dictionary of English v.0.48:

Slope \Slope\, a.
   Sloping. "Down the slope hills." --Milton.
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         A bank not steep, but gently slope.      --Bacon.
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WordNet (r) 3.0 (2006):

slope
    n 1: an elevated geological formation; "he climbed the steep
         slope"; "the house was built on the side of a mountain"
         [syn: slope, incline, side]
    2: the property possessed by a line or surface that departs from
       the horizontal; "a five-degree gradient" [syn: gradient,
       slope]
    v 1: be at an angle; "The terrain sloped down" [syn: slope,
         incline, pitch]