touch·back /ˈtʌʧˌbæk/
  美式足球的動作之一種
  Touch·back 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.
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  touchback
       n : (American football) a play in which the opposing team has
           kicked the football into your end zone