(1):
(v. i.) A sand bank in the sea, or a rock, or ledge of rocks, rendering the water shallow, and dangerous to ships.
(2):
(v. i.) A piece of timber running the whole length of a vessel inside the timberheads.
(3):
(v. i.) A flat tablet or ledge of any material set horizontally at a distance from the floor, to hold objects of use or ornament.
(4):
(v. i.) A stratum lying in a very even manner; a flat, projecting layer of rock.