A grate is a framework of metal bars in a fireplace, which holds the coal or wood.

If you grate food such as cheese or carrots, you rub it over a metal tool called a grater so that the food is cut into very small pieces.

When something grates, it rubs against something else making a harsh, unpleasant sound.

If something such as someone's behaviour grates on you or grates, it makes you feel annoyed.