noun
sealed move; move sealed until play resumes
Technical term in multi-day shogi and go games: the next move is written down, sealed, and opened when the game resumes, typically the following day.
名人戦の一日目は、挑戦者の封じ手で終わった。
The first day of the Meijin match ended with the challenger's sealed move.
二
On the morning of the second day, the official opened the sealed move.
noun
forbidden technique; prohibited move
Used for a maneuver or technique that is not allowed, especially in contexts such as sumo, martial arts, or competitive fighting. It overlaps in meaning with 禁じ手 but is a distinct use from the shogi/go sealed-move term.
相手の目を狙う攻撃は、この競技では封じ手とされている。
Attacks aimed at the opponent's eyes are treated as a forbidden technique in this sport.
A transparent compound of 封じ, from 封じる 'to seal, close off, prohibit,' and 手 'hand, move, technique.' In games it literally refers to a move that is sealed; the forbidden-technique sense reflects the idea of a move that has been closed off or prohibited.