This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
陒 combines ⻖ (mound, hill) with 危 (danger, precarious). The exact historical development is uncertain, but it likely relates to a dangerous or steep terrain feature.
The left side ⻖ suggests a hill or mound, and the right side 危 suggests danger. Imagine a precarious, crumbling hillside that is broken and steep.
For キ, picture a key stuck in a broken, dangerous hillside: key -> キ, and the key is lodged in the steep, ruined slope.