castling

(chess) A move in which the king moves two squares towards a rook, and the rook moves to the other side of the king; the action of the verb to castle.

(shogi) The act of constructing a defense structure in Japanese chess in which the king (玉) is positioned in a certain way so that it is protected by pawns (歩) and silver general(s) (銀) and/or gold general(s) (金) often with an additional knight (桂) and lance (香車).