This phrase came to mean a hidden, embarrassing secret. Here is where it came from, and why British and American English differ.

This phrase compares hidden talent or value to an uncut diamond, something that looks plain at first but can become brilliant.

Copper and Cyprus have a deep historical language link. The Latin name cuprum reflects the island’s importance in the ancient copper trade.

This phrase began as a literal dare in 1800s America. Today it describes someone who seems resentful, defensive, or eager to argue.