to reduce to powder by friction, as in a mill, or with the teeth; to crush into small fragments; to produce as by the action of millstones.-to wear down, polish, or sharpen, by friction; to make smooth, sharp, or pointed; to whet, as a knife or drill; to rub against one another, as teeth, etc.-to oppress by severe exactions; to harass.-to study hard for examination.-to perform the operation of grinding something; to turn the millstones.-to become ground or pulverized by friction; as, this corn grinds well.-to become polished or sharpened by friction; as, glass grinds smooth; steel grinds to a sharp edge.-to move with much difficulty or friction; to grate.-to perform hard aud distasteful service; to drudge; to study hard, as for an examination.-the act of reducing to powder, or of sharpening, by friction.-any severe continuous work or occupation; esp., hard and uninteresting study.-a hard student; a dig.