Definition of slush fund noun from the Oxford Advanced Learner's Dictionary

 

slush fund

 noun
noun
BrE
 
; NAmE
 
(disapproving)
 
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a sum of money kept for illegal purposes, especially in politics Word Origin mid 19th cent.: originally nautical slang denoting money collected to buy luxuries, from the sale of watery food known as slush.
See the Oxford Advanced American Dictionary entry: slush fund