noun
forking the rook while checking the king
A shogi tactic where a player simultaneously checks the opponent's king and attacks the rook, forcing the opponent to lose the rook.
王手飛車をかけて、相手の飛車をただで取った。
I executed a king-check rook-fork and captured the opponent's rook for free.
Compound of 王手 (check) + 飛車 (rook), literally 'king-check rook-fork'. The term is specific to shogi and describes a double threat.