Double coverage
Encyclopedia
In American
American football
American football is a sport played between two teams of eleven with the objective of scoring points by advancing the ball into the opposing team's end zone. Known in the United States simply as football, it may also be referred to informally as gridiron football. The ball can be advanced by...

 and Canadian football
Canadian football
Canadian football is a form of gridiron football played exclusively in Canada in which two teams of 12 players each compete for territorial control of a field of play long and wide attempting to advance a pointed prolate spheroid ball into the opposing team's scoring area...

 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.
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