To rub together or against strongly so as to produce a harsh scraping sound: as, to grate the teeth.To reduce to small particles by rubbing or rasping with something rough or indented: as, to grate a nutmeg or the peel of a lemon.To affect harshly and painfully, as if by abrasion; fret.To produce a harsh or jarring sound of, as by the friction of rough bodies.To scratch or scrape with; use for attrition or abrasion.To make a harsh or rasping sound by friction or attrition; give out a scraping noise.To produce a harsh impression; cause irritation or chafing.n. A grater.n. A partition made with bars parallel to or crossing one another; a framework of bars in a door, window, hatchway, or other opening.n. A frame of metal bars in which fuel is burned, especially coal.n. The floor of a fire-box or furnace, formed of a series or group of bars; the bottom of a furnace, on which the fuel rests, and through which it is supplied with air.n. In metallurgy: A perforated metal plate used in the stamping of ores, through which the pounded ore passes.n. A screen.n. An ore-roasting furnace with a grate revolving horizontally.To furnish with a grate or grates; fill in with cross-bars: as, to grate a window.Pleasant; agreeable.