slush fund(n = noun.possession) - a fund for buying votes or bribing public officials;
is a kind of fund, monetary fund

closed-end fund, endowment fund, fund, fund raise, hedge fund, imprest fund, index fund, international monetary fund, monetary fund, mutual fund, open-end fund, pension fund, reserve fund, retirement fund, revolving fund, sinking fund, slush, slush around, superannuation fund, trust fund, united nations children's fund