distant
遐 centers on the idea of being far away or distant, whether in space or time.
遐 combines 辶 (movement) with 叚, which likely contributes the sound and may relate to distance or farness. The exact historical development is uncertain.
The movement enclosure 辶 wraps around 叚, like a path stretching far into the distance. Picture a long road disappearing over the horizon.
For カ, imagine a distant car on that long road: car -> カ, and the car is so far away it's barely visible.
longevity; long life