Shoal

n.
  1. A great multitude assembled; a crowd; a throng; -- said especially of fish; as, a shoal of bass.

v. i.
  1. To assemble in a multitude; to throng; as, the fishes shoaled about the place.

a.
  1. Having little depth; shallow; as, shoal water.

n.
  1. A place where the water of a sea, lake, river, pond, etc., is shallow; a shallow.
  2. A sandbank or bar which makes the water shoal.

v. i.
  1. To become shallow; as, the color of the water shows where it shoals.

v. t.
  1. 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.