shoal

A large school of fish or other aquatic animals.

A large group; a crowd.

To come together in large numbers.

A shallow place in a body of water.

A sandy elevation of the bottom of a body of water, constituting a hazard to navigation; a sandbank or sandbar.

To become shallow.

To make shallow.

To come or sail into a shallower part of.

Having little depth; shallow.

A great multitude; a crowd; a throng; of fish, a school: as, a shoal of herring; shoals of people.