Verb (to castle)
The act of supplementing one’s pint of ale or stout with some form of hard spirit, traditionally a whisky. The glass containing spirit sits alongside the pint, separately.
A punter of a drinking establishment who has a pint and a separate spirit on the go, simultaneously, is said to be drinking "
castle kingside".
The term is derived from the chess move of the same name, whereby the king is moved two squares towards a
rook (castle) on the player's first rank, then the rook is moved to the square over which the king crossed. The outcome leaves the king and rook
side-by-side.