steamed bread, to feed
餧 centers on providing food: steamed bread as a specific food item, and the act of feeding someone or something.
餧 combines 飠 (food) with 委, which likely contributes the sound and may relate to entrusting or giving, suggesting giving food. The exact historical development is uncertain.
The food radical 飠 beside 委 (entrust) looks like entrusting food to someone: feeding them steamed bread.
For ダイ, imagine a person named Dai who loves to feed everyone steamed bread: Dai -> ダイ, and he entrusts food to all.