grindstone

n. 磨刀石

grievances, grieve, grieve over, grievous, grievous bodily harm, grievously, griffin, grill, grille (also grill), grim, grim-faced, grimace, grime, grimly, grimness, grimy, grin, grind, grinder, grinding, grip, gripe, gripe-water, gripping, grippingly, grisly, grist, gristle, gristly, grit, grits, grittiness, gritty, grizzle, grizzled, grizzly, Gro, groan, groats, grocer,