castling
/ˈkæslɪŋ/
noun
- A move in chess where the king moves two squares toward a rook, and the rook moves to the square the king crossed, done to protect the king.
- She decided against castling because it would leave her rook exposed.
- Castling is the only move in chess that involves two pieces at once.
- He used castling early in the game to keep his king safe.