This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 陿 is uncertain. It combines the mound radical ⻖ with 匧, but the original semantic and phonetic roles are unclear.
The mound radical ⻖ suggests a slope or barrier, and the right side 匧 looks like a container. Imagine a narrow passage between a mound and a box-like enclosure, hinting at something confined or narrow.
For キョウ, imagine a narrow Kyoto alley squeezed between mounds: Kyoto -> キョウ, and the alley feels tight and confined.