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Related to castling: en passant
a. A large fortified building or group of buildings with thick walls, usually dominating the surrounding country.
b. A fortified stronghold converted to residential use.
c. A large ornate building similar to or resembling a fortified stronghold.
2. A place of privacy, security, or refuge.
3. Games See rook2.
v. cas·tled, cas·tling, cas·tles
To move the king in chess from its own square two empty squares to one side and then, in the same move, bring the rook from that side to the square immediately past the new position of the king.
1. To place in or as if in a castle.
2. Games To move (the king in chess) by castling.
(Chess & Draughts) chess the act of moving the king two squares laterally on the first rank and placing the nearest rook on the square passed over by the king, either towards the king's side or the queen's side