Lingo
slush fund
an amount of money that is set aside to be used for dishonest or illegal activities
The idiom "slush fund" originated in the mid-19th century and has its roots in the practice of melting snow or ice to create a watery mixture known as "slush." This slush was often used to lubricate or clean machinery. It is often used in political or organizational contexts when referring to hidden or unauthorized funds used for questionable purposes.
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