伝家の宝刀を抜く でんかのほうとうをぬく Meanings Expression, Godan verb to employ one's secret weapon; to play one's trump card; to use the ace up one's sleeve Kanji 伝 transmit. Read as デン. 家 home 宝 treasure. Read as ホウ. 刀 katana. Read as トウ. 抜 pull out. Read as ぬく. Word lists Idioms Jinuma: Japanese Dictionary · Word lists