castling
/ˈkasəliNG/
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nounCHESS
the action of making a special move (no more than once in a game by each player) in which the king is transferred from its original square two squares along the back rank toward a rook on its corner square which is then transferred to the square passed over by the king.
“castling is more frequently a defensive than an attacking move”
Definitions from Oxford Languages
How to Castle in Chess
