Focus on the pronunciation of grind
English definition of “grind”
/grɑɪnd/ v [T] (past tense and past participle ground /grɑʊnd/) (RUB)
› to rub an object against a hard surface in order to make it sharper, thinner, or smoother: Laborers grind and shape steel bars into decorative fences. › If you grind two sets of objects, you press and rub them together in a way that makes an unpleasant noise: Ursula grinds her teeth at night.