TOUCHBACK
touchback
(noun) (American football) a play in which the opposing team has kicked the football into your end zone
Source: WordNet® 3.1
Etymology
Presumably: touchdown + back
Noun
touchback (plural touchbacks)
(American football) The result of a play (usually a kickoff or punt) in which the ball passes out the back of the end zone or a team otherwise gains possession of the ball in their own end zone.
The ball sailed into the end zone for a touchback and the Eagles had possession on the 20-yard line.
Source: Wiktionary
Touch"back`, n. (G)
Definition: The act of touching the football down by a player behind his
own goal line when it received its last impulse from an opponent; --
distinguished from safety touchdown.
Source: Webster’s Unabridged Dictionary 1913 Edition