This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
虁 is a rare character whose historical origin is uncertain. It visually contains 艹 (grass) above 夒, but the exact development is unclear.
With no clear meaning, picture a mysterious ancient creature: the grass radical 艹 on top and the complex 夒 below suggest something hidden in the wild.
For キ, imagine a key unlocking the secret of this rare kanji: key -> キ, and the key reveals the hidden creature under the grass.
—