"grates" in the noun sense
1. grate, grating
a frame of iron bars to hold a fire
a harsh rasping sound made by scraping something
3. grate, grating
a barrier that has parallel or crossed bars blocking a passage but admitting air
"grates" in the verb sense
furnish with a grate
"a grated fireplace"
2. eat into, fret, rankle, grate
gnaw into make resentful or angry
"The injustice rankled her"
"his resentment festered"
reduce to small shreds or pulverize by rubbing against a rough or sharp perforated surface
"grate carrots and onions"
4. grate, grind
make a grating or grinding sound by rubbing together
"grate one's teeth in anger"
5. scrape, grate
"The cat scraped at the armchair"
Source: WordNet® (An amazing lexical database of English)
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