distant, long-lasting

遐 is composed of the radical 辵 (walk, movement) and 叚 (borrow, false). 辵 is a pictograph of a foot walking on a road, implying distance, while 叚 depicts two hands grasping a cliff wall, meaning untrue or false. The greater the distance in space or time, the more illusory or unreal it feels, so 遐 refers to remote or long-lasting.