much, many
濔 centers on abundance, especially of water or something fluid: much, many, a great quantity.
濔 combines 氵 (water) with 爾, which likely contributes the sound and may carry a sense of fullness or abundance. The exact historical development is uncertain.
Water 氵 on the left and the full, intricate shape 爾 on the right: imagine a vast flood spreading everywhere, so much water that it becomes many streams.
For ビ, picture a bee buzzing over a huge, overflowing pond: bee -> ビ, and the pond is filled with much water.
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