sandbar

noun

1. a bar of sand formed in a river or sea by the action of tides or currents.

noun

1. a ridge of sand in a river or sea, built up by the action of tides, currents, etc, and often exposed at low tide

n.1755, from sand (n.) + bar (n.1).

1. A long mass or low ridge of submerged or partially exposed sand built up in the water along a shore or beach by the action of waves or currents.