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slush fund UK US noun [C] FINANCE
► money that is kept by a business or other organization for illegal purposes: »
The CEO treated this money as his own personal slush fund and used it to evade taxes.
»He was convicted of setting up a secret slush fund to bribe politicians.
► INFORMAL money that is kept for unexpected costs: »
We have set up a small slush fund to cover any unexpected running costs.
Financial and business terms. 2012.