skin
鞹 centers on skin, specifically raw or untanned animal hide. It refers to the outer covering of an animal in its natural state.
鞹 combines 革 (leather, hide) with 郭, which likely contributes the sound カク. The character specifically denotes raw skin or hide.
The left side 革 means leather or hide. The right side 郭 looks like a city wall, but here imagine it as the tough outer wall of an animal: raw skin.
For カク, picture a raw hide being stretched and dried on a rack: rack -> カク, and the hide is the skin.
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