castle

B1 · Intermediate Countable noun Informal

n. a chess piece that looks like a small tower.

n. a common informal name for the rook, a chess piece that moves in straight lines.

“He moved his castle across the board to put the king in danger.”

“The beginner mistakenly referred to the rook as a castle throughout the entire tournament match.”

B2 · Upper Intermediate Technical

v. to move your king and a tower piece at the same time in a special chess move.

v. to execute a special move in chess involving the king and either rook to improve king safety.

“It is usually a good idea to castle early in the game to keep your king safe.”

“The grandmaster decided to castle kingside to consolidate his defensive position before launching a counter-attack.”