sprinkle, splash
濺 centers on liquid scattering in small drops: sprinkling or splashing water or another fluid.
濺 combines 氵 (water) with 賤, which likely contributes the sound セン and may relate to scattering or low-value drops. The exact historical development is uncertain.
Water 氵 beside 賤 (a shape suggesting something scattered or cheap) gives the image of water droplets being sprinkled or splashed around carelessly.
For セン, picture a thousand (千, せん) tiny water droplets sprinkling from the left side: 千 -> セン, and each drop splashes.