貴き姉し

pronoun

your older sister

Honorific pronoun used to refer to the addressee's older sister, mainly in formal letters.

• 貴き姉しによろしくお伝つたえください。

  Please give my regards to your older sister.

pronoun

you (to an older woman)

Used primarily by men in letters to address an older woman respectfully. Rare and old-fashioned.

• 貴き姉しにはいつもお世せ話わになっております。

  I am always indebted to you (older woman).