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 way it works is that Groupon offers different deals each day for a local good, service or event in a city where it operates. Discounts range from 50 percent to 90 percent off. The promotion is only valid if a certain number of consumers purchase the deal within 24 hours.