'Grind' in the Bible

What do you mean that you crush my people, and grind the face of the poor?" says the Lord, Yahweh of Armies.

Bread flour must be ground; so he will not always be threshing it. Although he drives the wheel of his threshing cart over it, his horses don't grind it.

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