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To reduce to fragments, shreds, or powder by rubbing against an abrasive surface.
(verb-transitive)
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To cause to make a harsh grinding or rasping sound through friction: grated her teeth in anger.
(verb-transitive)
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To irritate or annoy persistently.
(verb-transitive)
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Archaic To rub or wear away.
(verb-transitive)
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To make a harsh rasping sound by or as if by scraping or grinding.
(verb-intransitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.