partly melted snow.
liquid mud; watery mire.
waste, as fat, grease, or other refuse, from the galley of a ship.
a mixture of grease and other materials for lubricating.
silly, sentimental, or weakly emotional talk or writing: romantic slush.
verb (used with object)
to splash with slush.
to grease, polish, or cover with slush.
to fill or cover with mortar or cement.
to wash with a large quantity of water, as by dashing it on.

1635–45; apparently cognate with Norwegian slusk slops, Swedish slask mud, slops Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
slush (slʌʃ)
1.  any watery muddy substance, esp melting snow
2.  informal sloppily sentimental language
3.  nautical waste fat from the galley of a ship
vb (often foll by along)
4.  to make one's way through or as if through slush
5.  (intr) to make a slushing sound
[C17: related to Danish slus sleet, Norwegian slusk slops; see sludge, slosh]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1641, perhaps from a Scand. source (cf. Norw. and Sw. slask "slushy ground;" obs. Dan. 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.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The vibrant color of these lavender margaritas come from blueberries and
  raspberries whirled to an icy slush.
But it would always go away without leaving any slush, and then return to being
Never mind the carefully crafted manuscripts languishing in slush piles all
  across the country.
They raised a layer of dripping slush and examined it carefully.
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