'Touchback' definitions:

Definition of 'touchback'

(from WordNet)
noun
(American football) a play in which the opposing team has kicked the football into your end zone

Definition of 'Touchback'

From: GCIDE
  • Touchback \Touch"back`\ (t[u^]ch"b[a^]k`), n. (Football) 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. [1913 Webster]