wrapper or case for bow
韔 refers to a wrapper or case specifically for a bow, a protective covering used to store or carry a bow.
韔 combines 韋 (leather) and 長 (long), suggesting a long leather case for a bow. The exact historical development is uncertain, but the component choice fits the meaning.
The left side 韋 relates to leather, and the right side 長 means long. Imagine a long leather wrapper made to hold a bow securely.
For チョウ, picture a long leather bow case with a distinctive label: 'Chou's Bow Case'. The name Chou (pronounced 'choh') cues チョウ while the case holds the bow.