wandering
徊 centers on aimless movement: wandering or roaming without a fixed destination.
徊 combines 彳 (movement) with 回 (turn, revolve), suggesting going around in circles or wandering. The exact historical development is uncertain, but the component relationship is plausible.
The left side 彳 shows a path or step, and the right side 回 means to turn or revolve. Picture someone walking in circles, turning again and again, wandering without a clear direction.
For カイ, imagine a wandering kite (カイト) drifting aimlessly in the sky: kite -> カイ, and the kite's path is a wandering loop.