n. [棋]王车易位

[ noun ]
interchanging the positions of the king and a rook
<noun.act>

Castle \Cas"tle\, v. i. [imp. & p. p. {Castled}; p. pr. & vb. n.
{Castling}.] (Chess)
To move the castle to the square next to king, and then the
king around the castle to the square next beyond it, for the
purpose of covering the king.


Castling \Cast"ling\, n.
That which is cast or brought forth prematurely; an abortion.
--Sir T. Browne.


Castling \Cas"tling\, n. (Chess)
A compound move of the king and castle. See {Castle}, v. i.