blood
衁 centers on blood as a substance, with no strong abstract extensions in the given meanings.
衁 combines 亡 (often associated with loss or death) and 血 (blood), suggesting blood related to death or loss. The exact historical development is uncertain.
The top 亡 suggests something lost or gone, and the bottom 血 is blood. Picture blood spilled from a fatal wound: 衁 is blood.
For コウ, imagine a pool of blood that looks like a dark koh (invented word) liquid: koh -> コウ, and the blood pools beneath the lost life.