Shoal

1. A place where the water of a sea, lake, river, pond, etc., is shallow; a shallow.
2. To cause to become more shallow; to come to a more shallow part of; as, a ship shoals her water by advancing into that which is less deep.
3. A great multitude assembled; a crowd; a throng; -- said especially of fish; as, a shoal of bass.
4. Having little depth; shallow; as, shoal water.
5. To assemble in a multitude; to throng; as, the fishes shoaled about the place.
6. A sandbank or bar which makes the water shoal.
7. To become shallow; as, the color of the water shows where it shoals.