to soften (the color or tone of a painted area) by overlaying parts with opaque or semiopaque color applied thinly and lightly with an almost dry brush.
the act or technique of scumbling.
the effect produced by this technique.
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British Dictionary definitions for scumble
(in painting and drawing) to soften or blend (an outline or colour) with an upper coat of opaque colour, applied very thinly
the upper layer of colour applied in this way
the technique or effects of scumbling
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012