fifthdown
Fifth down is a term used in discussions of American football to describe a situation in which a team is perceived to have been granted an extra down beyond the standard four down system. In formal play, there is no official fifth down; the rule set in modern football provides four downs to advance the ball a required distance. A fifth-down scenario typically arises only when there is an officiating error, misapplication of the rules, or a disputed count that creates the appearance of an additional down. When identified, such incidents are generally addressed through corrective measures, such as adjusting the down count or nullifying plays, though the exact remedy depends on the governing rules and the point in the contest.
Origins of the term are linked to the evolution of down-and-distance rules in the early history of
Notable discussions of fifth downs tend to appear in sports journalism and historical retrospectives as examples
See also: Down (American football), Penalty (American football), Officiating errors in sports.