sinking fund
 償債基金


 Sink·ing, a. & n. from Sink.
 Sinking fund. See under Fund.
 Sinking head Founding, a riser from which the mold is fed as the casting shrinks. See Riser, n., 4.
 Sinking pump, a pump which can be lowered in a well or a mine shaft as the level of the water sinks.

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 Fund n.
 1. An aggregation or deposit of resources from which supplies are or may be drawn for carrying on any work, or for maintaining existence.
 2. A stock or capital; a sum of money appropriated as the foundation of some commercial or other operation undertaken with a view to profit; that reserve by means of which expenses and credit are supported; as, the fund of a bank, commercial house, manufacturing corporation, etc.
 3. pl. The stock of a national debt; public securities; evidences (stocks or bonds) of money lent to government, for which interest is paid at prescribed intervals; -- called also public funds.
 4. An invested sum, whose income is devoted to a specific object; as, the fund of an ecclesiastical society; a fund for the maintenance of lectures or poor students; also, money systematically collected to meet the expenses of some permanent object.
 5. A store laid up, from which one may draw at pleasure; a supply; a full provision of resources; as, a fund of wisdom or good sense.
    An inexhaustible fund of stories.   --Macaulay.
 Sinking fund, the aggregate of sums of money set apart and invested, usually at fixed intervals, for the extinguishment of the debt of a government, or of a corporation, by the accumulation of interest.


 sinking fund
      n : a fund accumulated regularly in a separate account and used
          to redeem debt securities