This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development is uncertain. The character combines 鼻 (nose) with 曷, but the original semantic or phonetic role of 曷 in this compound is unclear.
The left side is 鼻 (nose). The right side 曷 might suggest a sound or idea, but without a clear meaning, picture a nose with an unknown mark beside it, representing something obscure.
For カツ, imagine a cat sneezing loudly through its nose: cat -> カツ, and the nose 鼻 is the focus.