decorate, ornament, adorn, embellish
餝 centers on adding beauty or refinement to something: decorating, ornamenting, adorning, or embellishing. The meanings all share the idea of making something more attractive or elaborate.
餝 is a rare variant of 飾. Both combine 飠 (food) with a phonetic component that also carries the idea of decorating or embellishing. The exact historical development of the right-side component is uncertain.
The left side 飠 suggests food, and the right side 芳 looks like a decorated table setting. Picture a feast where every dish is beautifully adorned and embellished.
For コウ, imagine a court chef decorating an elaborate cake: the chef's name is Kou, and Kou -> コウ as he adorns the dessert.