This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鼼 combines 鼻 (nose) with 丩, but the exact historical development and original meaning are uncertain. It may have been a character related to nasal conditions or sounds, but no clear etymology is established.
The left side 鼻 means nose, and the right side 丩 looks like a twisted shape. Imagine a nose with a twisted or crooked bridge, but since the meaning is unclear, use this only as a visual reminder.
For キュウ, imagine a nose making a cute 'kyu' sound when pinched: kyu -> キュウ, and the nose 鼻 is the focus.