Wiktionary
n. (context roofing English) Application of asphalt, slate, or wood roofing such that the lapped portion is at least two inches wider than the exposed portion, resulting in two layers of roofing material over the deck.
Wikipedia
In American and Canadian football double coverage is a state of defensive playcalling wherein two defensive players are assigned to "cover" one offensive player. This situation is often seen with standout wide receivers and running backs.
Note: It is actually extremely rare to nonexistent to have 2 DBs man-cover a single receiver. Commentators who use the term "double-coverage" almost always mean a CB covering a WR man-to-man, with a safety playing over the top (typically trying to stay in front of the WR's route) for deep ball assistance.
Category:American football terminology Category:Canadian football terminology