coupon
Pronunciation: /ˈkuːpɒn/
noun
- 1a voucher entitling the holder to a discount off a particular product.
- a detachable ticket entitling the holder to a ration of food, clothes, or other goods, especially in wartime.
- a detachable portion of a bond which is given up in return for a payment of interest.
- the nominal rate of interest on a fixed-interest security: the stock carries a 10 per cent coupon
verb
- (of a business) issue or distribute coupons or vouchers offering discounts on particular goods or services: the company announced plans to reduce its couponing and just cut prices instead
- (of a consumer) collect and use coupons or vouchers offering discounts on goods or services: couponing has dropped their monthly grocery budget by upwards of $1,100.00 per month since she’d only been couponing for a few weeks, she didn’t have much of a grocery stockpile built up

Origin:
early 19th century (denoting a detachable portion of a stock certificate): from French, literally 'piece cut off', from couper 'cut', from Old French colper (see cope1)