What is the meaning of grate?

noun

• A frame of iron bars to hold a fire.
  • synonyms: grating
• A harsh rasping sound made by scraping something.
• A barrier that has parallel or crossed bars blocking a passage but admitting air.
  • synonyms: grating

verb

• Furnish with a grate.
  • usage: "a grated fireplace"
• Gnaw into; make resentful or angry.
  • usage: "The injustice rankled her"; "his resentment festered"
  • synonyms: eat into, fret, rankle
• Reduce to small shreds or pulverize by rubbing against a rough or sharp perforated surface.
  • usage: "grate carrots and onions"; "grate nutmeg"
• Make a grating or grinding sound by rubbing together.
  • usage: "grate one's teeth in anger"
  • synonyms: grind
• Scratch repeatedly.
  • usage: "The cat scraped at the armchair"
  • synonyms: scrape