to turn over (face down); to lay face down; to lay upside down ; to point downwards (eyes, head, etc.); to cast down (eyes) ; to lie (one's body) face down; to lie flat (on the ground) ; to conceal; to hide; to keep secret; to place in hiding (e.g. troops for an ambush) ; to lie down; to retire; to go to bed (with an illness)