Touchback

[Sarah]

The act of touching the football down by a player behind hisown goal line when it received its last impulse from an opponent; --distinguished from safety touchdown.

[Couch Potatoe]

Touchback in American Football. Should a player receiving a kickoff or punt in his own end zone, catch the ball then he may go down and play will resume with his team in possession on the 20yd line.