boorish, urgent
倥 centers on a rough, unrefined state: boorishness or crudeness. The urgent sense is a separate, less common meaning that does not clearly connect to the core idea of boorishness.
倥 combines 亻 (person) with 空, which likely contributes the sound. The exact historical development of the meaning 'boorish' or 'urgent' from these components is uncertain.
A person 亻 standing beside emptiness 空: imagine a boorish person who is empty-headed and crude.
For コウ, picture a boorish person shouting 'Koh!' in an empty room: Koh -> コウ, and the rude outburst fits the boorish meaning.
hurrying