Just in case, me forgot:
v. grat·ed, grat·ing, grates
1. To reduce to fragments, shreds, or powder by rubbing against an abrasive surface.
2. To cause to make a harsh grinding or rasping sound through friction: grated her teeth in anger.
3. To irritate or annoy persistently: It always grates me to get put on hold.
4. Archaic To rub or wear away.