'Grind' in the Bible

what mean ye that ye crush my people, and grind the face of the poor? saith the Lord, Jehovah of hosts.

Bread grain is ground; for he will not be always threshing it: and though the wheel of his cart and his horses scatter it, he doth not grind it.

Take the millstones, and grind meal; remove thy veil, strip off the train, uncover the leg, pass through the rivers.