copper

A coin made of copper or a low-value coin, often historical.

"He didn't have a single copper."

To cover or coat something with a layer of copper.

"They coppered the ship's hull."

An informal, often slang, term for a police officer.

"The coppers arrived quickly at the scene."

A reddish-brown metallic element, excellent conductor of heat and electricity.

"Copper wiring is common in homes."