die out, dim
泯 centers on fading away into nothing: dying out, becoming dim, or vanishing completely.
泯 combines 氵 (water) with 民, which likely contributes the sound. The idea of water erasing or washing away may connect to the meaning of dying out or dimming.
Water 氵 washes over the people 民, and they slowly fade away until nothing is left. 泯 means to die out or become dim.
For ビン, imagine a bin of water slowly emptying as the contents vanish: bin -> ビン, and the water washes everything away into nothing.