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.
Online merchants offer coupon codes as an incentive to shoppers to purchase from their Web site. Many online merchants do not offer the coupon code directly on their own Web site, but instead will use well-known affiliate programs or offer the discount codes in their e-mail newsletter. Also called an e-coupon or digital coupon.