n.(American football) a play in which the opposing team has kicked the football into your end zone
英汉双解大词典
touchback/ˈtʌtʃˌbæk/
1.
N（名词）
a play in which the ball is put down by a player behind his own goal line when the ball has been put across the goal line by an opponent 持球触地 [American football] → compare safety