hood, cowl, turban, stumble
跲 centers on a sudden loss of footing or balance: stumbling or tripping. The meanings "hood", "cowl", and "turban" are unrelated to this core and likely represent a separate rare usage; treat them as distinct and uncertain.
跲 combines 足 (foot) with 合, which likely contributes the sound. The original meaning relates to stumbling or tripping, fitting the foot radical. The connection to headwear is unclear and may be a separate, rare usage.
The left side is 足 (foot), and the right side is 合 (fit/join). Imagine a foot that doesn't fit the ground properly, causing a stumble.
For コウ, picture a foot catching on a coat (コート) and causing a stumble: coat -> コウ.