carry meal to workers in field
饁 centers on delivering food to people working outdoors, specifically carrying a meal to field laborers.
饁 combines 飠 (food) with 盍, which likely contributes the sound and may relate to covering or joining, but the exact historical development is uncertain.
The food radical 飠 on the left suggests a meal, and the right side 盍 looks like a covered dish over a container. Picture carrying a covered meal out to workers in the field.
For ヨウ, imagine a worker in the field yelling 'Yo!' when they see you bringing the meal: Yo! -> ヨウ.