Scum"ble (?), v. t. [imp. & p. p. Scumbled (?); p. pr. & vb. n. Scumbling (?).] [Freq. of scum. &root; 158.] Fine Arts
To cover lighty, as a painting, or a drawing, with a thin wash of opaque color, or with color-crayon dust rubbed on with the stump, or to make any similar additions to the work, so as to produce a softened effect.
© Webster 1913.