slough (plural sloughs) 1  The skin shed by a snake or other reptile. That is the slough of a rattler; we must be careful. 2  Dead skin on a sore or ulcer. This is the slough that came off of his skin after the burn.
The name Groupon is a combination of the words group and coupon, which references the company's viral marketing business model.
The definition of a coupon is a voucher or code entitling you to a product or a special deal, or a part of a bond that you can detach and send in to get interest. 1  A paper entitling you to 10 percent off of a meal in a restaurant is an example of a coupon. The part of a savings bond that you can detach and use to redeem interest payments is an example of a coupon.