This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 倄 is uncertain. It visually combines 亻 (person) with 肴, but the original role of these components is unclear.
With no clear meaning, picture a person 亻 holding a side dish 肴, but the scene is ambiguous—perhaps a person serving food, though the true meaning is lost.
For コウ, imagine a person 亻 calling out 'ko!' while offering a dish 肴: the sound 'ko' cues コウ, though the kanji's meaning remains uncertain.