和英辞書

かし

particle

(archaic) Shows emphasis.

あの山は高いかし、登るのは大変だ。

That mountain is high indeed, but climbing it is difficult.

意味（1）

(archaic) Shows emphasis.

c. 1001–1014, Murasaki Shikibu, Genji Monogatari

c. 1001–1014, Murasaki Shikibu, Genji Monogatari わざとあめるを、早(はや)うものせよかし。

Wazato a meru o, hayō monoseyo kashi.It seems to be a special [invitation], so please go early.