slushyoudaoicibaDictYouDict[slush 词源字典]
slush: [17] Like the very similar (and perhaps ultimately identical) slosh [19] and sludge [17], slush probably originated in imitation of the sound of squelching or splashing. The similarity of early modern Danish slus ‘sleet, mud’ and Norwegian slusk ‘slushy’ suggests the possibility of a Scandinavian borrowing rather than a native formation. Slush fund [19] comes from the use of slush for ‘grease that is a byproduct of cooking in a ship’s galley’, the allusion being to the ‘greasing’ of people’s palms with money.
[slush etymology, slush origin, 英语词源]
slush (n.)youdaoicibaDictYouDict
1640s, "melting snow, snow and water," perhaps from a Scandinavian source (compare Norwegian and Swedish slask "slushy ground;" obsolete Danish slus "sleet"), all probably imitative of the sound of sloshing. Slush fund is first attested 1839, from an earlier sense of slush "refuse fat" (1756); the money from the sale of a ship's slush was distributed among the officers, which was the original sense of the phrase. The extended meaning "money collected for bribes and to buy influence" is first recorded 1874, no doubt with suggestions of "greasing" palms.