discount; allowance; rebate; abatement

• Oh, no sir. We already gave you a discount on each item.

  哦，不行，先生。每一件东西我们都给你打过折扣了。

• I mean an allowance you are going to pay us, saying monthly, even if the sale does not warrant it .

  我指的是即使销售得不到保障，按月计算您将付给我们折扣。