to go bald
鬜 centers on the process of losing hair: going bald. It describes the state or action of becoming hairless on the head.
鬜 combines 髟 (hair) with 閒, which likely contributes the sound. The character expresses the idea of hair loss or baldness.
The top 髟 shows hair, and the bottom 閒 looks like a gap or space between doors. Imagine hair falling out, leaving a bald gap on the head.
For カン, picture a can of hair tonic that fails to stop balding: can -> カン, and the hair still falls out.