dike

A long wall or embankment built to prevent flooding from water.

"The sea wall acts as a dike protecting the town."

A long, narrow ditch or drain, often marking a boundary.

"Farmers dug a dike to drain the field."

To build a protective wall or drain an area using a ditch.

"They will dike the land to prevent erosion."

An offensive and derogatory term for a lesbian woman.

"Using "dike" is considered a highly offensive slur."