[scum.ble] vt scum.bled ; scum.bling [perh. freq. of
[2]scum] (1798) 1 a: to make (as color or a painting) less brilliant by covering with a thin coat of opaque or semiopaque color b: to apply (a color) in this manner
2: to soften the lines or colors of (a drawing) by rubbing lightly
[2]scumble n (1834) 1: the act or effect of scumbling
2: a material used for scumbling