\Scum"bling\, n.
1. (Fine Arts)
   (a) A mode of obtaining a softened effect, in painting and
       drawing, by the application of a thin layer of opaque
       color to the surface of a painting, or part of the
       surface, which is too bright in color, or which
       requires harmonizing.
   (b) In crayon drawing, the use of the stump.
2. The color so laid on. Also used figuratively.
         Shining above the brown scumbling of leafless
         orchards.                             --L. Wallace.