noun
handicap of one rook or bishop
In shogi, a game where the stronger player removes one rook or bishop before play begins. Also used figuratively to mean being outclassed or at a clear disadvantage.
See also: 駒落ち (こまおち)
彼と将棋を指すときは、いつも一枚落ちでお願いしている。
When I play shogi with him, I always ask for a one-piece handicap.
あの議論では、彼は私より一枚落ちだった。
In that debate, he was clearly outclassed by me.