GRIND is validvalid

to wear, smooth, or sharpen by friction [v GRINDED, GRINDING, GRINDS, GROUND] : GRINDER [n], GRINDINGLY [adv]

8,869 of 196,601 in NWL2023·also valid in CSW24

to wear, smooth or sharpen by friction [v GROUND or GRINDED, GROUNDEN, GRINDING, GRINDS]