This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
鵊 combines 鳥 (bird) with 夾, which likely contributes the sound. The exact historical development is uncertain.
The bird radical 鳥 on the right suggests a bird, but the overall meaning is unclear. Think of it as a mysterious bird with a clipped shape on the left.
For コウ, imagine a bird making a low 'coo' sound: coo -> コウ, and the bird shape 鳥 reinforces the image.