castle

noun

A large building that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king.
An instance of castling.
A rook; a chess piece shaped like a castle tower.
A defense structure in shogi formed by defensive pieces surrounding the king.
A close helmet.
Any strong, imposing, and stately mansion.
A small tower, as on a ship, or an elephant's back.
The wicket.

verb

To house or keep in a castle.
To protect or separate in a similar way.
To make into a castle: to build in the form of a castle or add (real or imitation) battlements to an existing building.
(usually intransitive) To move the king 2 squares right or left and, in the same turn, the nearest rook to the far side of the king. The move now has special rules: the king cannot be in, go through, or end in check; the squares between the king and rook must be vacant; and neither piece may have been moved before castling.
(usually intransitive) To create a similar defensive position in Japanese chess through several moves.
To bowl a batsman with a full-length ball or yorker such that the stumps are knocked over.

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