This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The historical origin of 艽 is uncertain. It combines 艹 (grass) with 九, but the intended meaning and component function are unclear.
With grass on top and 九 below, imagine a patch of nine mysterious grasses whose purpose is unknown, reflecting the kanji's uncertain meaning.
For キュウ, picture the number nine (九, きゅう) hidden under the grass: nine -> キュウ, and the grass covers the nine.