落らく胤いん

noun

nobleman's illegitimate child

Refers specifically to a child born out of wedlock to a noble or high-ranking samurai. Often used in historical contexts.

• 彼かれは戦せん国ごく大だい名みょうの落らく胤いんだと噂うわさされている。

  He is rumored to be the illegitimate child of a Sengoku-period daimyo.