1 (in painting and drawing) to soften or blend (an outline or colour) with an upper coat of opaque colour, applied very thinly
2 the upper layer of colour applied in this way
3 the technique or effects of scumbling
(C18: probably from scum)
English Collins Dictionary - English Definition & Thesaurus
to cover with a thin layer of paint applied with a dry brush in order to soften or blur a figure or outline
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