1. [countable] one of the defending players in hockey or rugby whose position is between those who play at the front of a team and those who play at the backTopics

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2. (also tailback)
   [countable] one of the two attacking players in American football whose position is behind the quarterback and next to the full backsTopics
3. [uncountable] the position a half back plays at (also called a tailback in American football)

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