fine
膴 centers on the idea of fine, rich, or abundant flesh, often describing meat that is plump and of good quality. The single given meaning "fine" likely refers to this sense of lushness or excellence in a physical, meaty context.
膴 combines ⺼ (meat, flesh) with 無, which likely acts as a phonetic component. The exact historical development is uncertain, but the structure suggests a character related to meat or flesh with a reading derived from 無.
The left side ⺼ is meat, and the right side 無 can suggest abundance or fullness. Picture a plump, fine cut of meat so rich it seems almost excessive.
For コ, imagine a fine cut of meat being served to a child: 子 (こ, child) -> コ, and the child enjoys the fine, rich meat.