forbidden move; prohibited move; foul
Used in sumo, shogi, go, and other competitive games for a move that is against the rules. Also used figuratively for an unfair or unacceptable action in other contexts.
Using a forbidden move in sumo results in a loss by foul.
That politician's methods are said to be a prohibited move.
Standard spelling; the most common written form.
Abbreviated spelling, often used in game contexts.
Compound of 禁じ (continuative form of 禁じる 'to forbid') + 手 ('move, technique').