war chest

/W AO1 R CH EH1 S T/
noun
  1. 1

    A fund to finance a war

    โ€œthe holdings of the state (the war chest plus other cash balances) - โ€œThe First World Warโ€, Hew Strachan, Oxford University Press, 2003.โ€

  2. 2

    (by extension) A fund for some special purpose, such as a political campaign

Source: https://en.wiktionary.org/wiki/war%20chest