A shallow portion of an otherwise deep body of water.

“The ship ran aground in an unexpected shallow.”

A fish, the rudd.

A costermonger's barrow.

To make or become less deep.

Having little depth; significantly less deep than wide.

“Saute the onions in a shallow pan.”

Extending not far downward.

“The water is shallow here.”

Concerned mainly with superficial matters.

“It was a glamorous but shallow lifestyle.”