This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
僙 combines 亻 (person) with 黃, but the exact historical development and original meaning are uncertain.
A person 亻 beside 黃 (yellow) might suggest a bold or fierce demeanor, but the meaning is not well established.
For コウ, imagine a person 亻 with a yellow 黃 coat (コート) acting boldly: coat -> コウ.