slush fund

noun
🔊/ˈslʌʃ fʌnd/
🔊/ˈslʌʃ fʌnd/
(disapproving)
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  1. a sum of money kept for illegal purposes, especially in politics(尤指用于政治目的的)非法基金
    Word Originmid 19th cent.: originally nautical slang denoting money collected to buy luxuries, from the sale of watery food known as slush.