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Definition of abrade : 1. Same as Abraid.
2. To rub or wear off; to waste or wear away by friction; as, to abrade rocks.

Synonyms:

scour, skin, flush, massage, rub down, knead, rub off, corrade, purge, excoriate, abrase, gall, help, stub

dot, speck, blemish, notch, pockmark, deface, splotch, scar, fleck, disfigure, check, tarnish, mar, hurt, deform, blister, fracture, flaw, distort, blot, nick, chip, crack, mark, spot, gash, damage, score, defect, stain, scuff, slit, taint, scrape, kink, discolor, freckle, scratch, spoil, hack

derogate, malign, cast aspersion, detract, diminish, defame, reduce, depreciate, lessen, discount, disparage, decry

chafe, scrub, grate, rasp, grind, harass, wear, resist, irritate, rub, aggravate, disturb, fret

Usage examples:

• Stones which lie underneath the glacier and are pushed along by it sometimes adhere to the ice, and as the mass glides slowly along at the rate of a few inches, or at the utmost 2 or 3 feet per day, abrade, groove, and polish the rock, and the larger blocks are reciprocally grooved and polished by the rock on their lower sides. - "The Antiquity of Man", Charles Lyell.
• Waves abrade the shore and strew the debris worn from it over the lake bed. - "The Elements of Geology", William Harmon Norton.
• Compare the ways in which different agents abrade. - "The Elements of Geology", William Harmon Norton.