sinking fund(n = noun.possession) - a fund accumulated regularly in a separate account and used to redeem debt securities;
is a kind of fund, monetary fund

N  treasury, bank, exchequer, fisc, hanaper, cash register, kutcherry, bursary, strong box, strong hold, strong room, coffer, chest, safe, bank vault, depository, till, tiller, purse, money bag, money box, porte-monnaie, purse strings, pocket, breeches pocket, sinking fund, stocks, public stocks, public funds, public securities, parliamentary stocks, parliamentary funds, parliamentary securities, Consols, credit mobilier, bonds.

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, sinking feeling, sinking spell, slush fund, superannuation fund, trust fund, united nations children's fund