to strain spirits, dregs, lees, river in Guangxi, abundant, bright
湑 centers on the process of straining liquid, especially spirits, leaving behind dregs or lees. The senses of abundance and brightness are likely extended from the clarity of strained liquid, while the river name is a specific geographic application.
湑 combines the water radical 氵 with 胥, which likely contributes the sound. The character is associated with straining liquid, but the exact historical development of the meaning components is uncertain.
The water radical 氵 beside 胥 suggests a liquid being processed. Picture pouring a cloudy spirit through a cloth held by a hand (胥 can be seen as a hand over a vessel), leaving clear liquid above and dregs below.
For ショ, imagine a showy bartender straining a cocktail with a flourish: show -> ショ, and the liquid passes through the strainer.
to pour out every drop