[ˈkɑːslɪŋ], (Noun)

Definitions:
- 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 towards a rook on its corner square which is then transferred to the square passed over by the king
(e.g: castling is more frequently a defensive than an attacking move)


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