名词

1. (购物的)赠券，优惠券
A coupon is a piece of printed paper which allows you to pay less money than usual for a product, or to get it free.

2. (剪自报刊的)咨询单，订货单，参赛表
A coupon is a small form, for example in a newspaper or magazine, which you send off to ask for information, to order something, or to enter a competition.

1. a test sample of some substance

2. a negotiable certificate that can be detached and redeemed as needed

Synonym: voucher