saver

saver
noun
  1. a person who regularly saves money through a bank or recognized scheme
    储蓄者,存款人
  2. [in combination]an object, action, or process that prevents a particular kind of resource from being used up or expended
    节约的装置(或行为,过程)
    it is cheaper as well as a great space-saver.
    它既省空间又便宜。
  3. a travel fare offering reductions on the standard price
    比正常价格低的旅费
    a new saver from London to Edinburgh.
    从伦敦到爱丁堡的新的折扣价。
  4. (Horse Racing, informal)a hedging bet
    (赛马, 非正式)两面下注
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