It may be a convenience to The Word Den's gloriously international audience to know that, although in most places a slush fund is a secret account containing money designed for corrupt purposes, in US ships a slush fund holds money made from the sale of kitchen waste.
Though this is, obviously, a distinction with very little difference.
photo by Ben Salter
Sunday Rest: slush fund. Slush is related to the Danish slus, sleet and the Norwegian slusk, slops. The word fund comes from the Latin fundus, which can mean either the bottom, or a piece of land.