pheasant, variegated, to fly
翬 centers on a pheasant in motion: the bird itself, its variegated plumage, and the act of flying. The meanings connect through the image of a colorful pheasant taking flight.
翬 combines 羽 (feathers, wings) with 軍, which likely contributes a phonetic element. The character is associated with a pheasant, its colorful feathers, and flight.
Feathers 羽 above an army 軍: picture a pheasant with wings spread wide, its variegated feathers flashing like military banners as it flies.
For キ, imagine a key-shaped feather unlocking the sky: key -> キ, and the pheasant uses its wings to fly.