'Down' in the Bible

When I heard this thing, I tore my garment and my robe, and plucked off the hair of my head and of my beard, and sat down confounded.

Now while Ezra prayed and made confession, weeping and casting himself down before the house of God, there was gathered together to him out of Israel a very great assembly of men and women and children; for the people wept very bitterly.

The children of the captivity did so. Ezra the priest, [with] certain heads of fathers' [houses], after their fathers' houses, and all of them by their names, were set apart; and they sat down in the first day of the tenth month to examine the matter.