pen, to surround
阹 centers on enclosing or surrounding an area, like a pen for animals or a barrier that encircles something.
阹 combines ⻖ (mound, hill) with 去, which likely contributes the sound. The mound radical suggests an earthen enclosure or barrier, fitting the meaning of a pen or surrounding area.
The left side ⻖ looks like a hill or mound, and the right side 去 means 'go away'. Picture a mound built to keep animals from going away, forming a pen that surrounds them.
For キョ, imagine a key (キー) shaped like a pen that locks the enclosure: key -> キョ, and the pen keeps everything inside.