This rare kanji has no clear standalone meaning. Treat its meaning as uncertain.
The exact historical development of 韛 is uncertain. It contains 韋 (tanned leather) on the left, suggesting a connection to leather objects, but the right component's origin is unclear.
Since the meaning is unclear, focus on the shape: 韋 (leather) on the left suggests something made of leather, but the right side is obscure. Picture a mysterious leather object whose purpose is unknown.
For ハイ, imagine a leatherworker saying 'Hi!' (ハイ) while holding this mysterious leather item. The greeting 'Hi' cues ハイ.