trump; trump card / (figuratively) trump; trump card; last resort; ace up one's sleeve; ace in the hole; secret weapon

(mahjong) hand of man: win by discard on the first go-around of play; depending on the rules, it can be worth 役満 (yakuman, “limit”), 倍満 (baiman), 満貫 (mangan), or any other number of points

燐肥: Short for 燐酸肥料. / 鱗被: lodicule

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