scumble
v.
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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scum
1 algae, crust, dross, film, froth, impurities, offscourings, scruff
2 (figurative) canaille, dregs of society, dross, lowest of the low, rabble, ragtag and bobtail, riffraff, rubbish, trash (chiefly U.S. & Canad.)
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"