伝でん家か

noun

family heirloom; trump card; last resort

Primarily used in the idiom 伝家の宝刀 (でんかのほうとう), meaning a treasured family sword passed down through generations, and figuratively a last-resort trump card or ultimate weapon. The standalone noun 伝家 is rare; the idiomatic usage dominates.

• 彼かれは伝でん家かの宝ほう刀とうを抜ぬくことにした。