half back
noun/ˈhɑːf bæk/
/ˈhæf bæk/
(also half)
(North American English halfback)
- [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 back
（曲棍球或橄榄球）前卫 - (also tailback)[countable] one of the two attacking players in American football whose position is behind the quarterback and next to the full backs
（美式橄榄球的）半卫 - [uncountable] the position a half back plays at (also called a tailback in American football)
半卫的位置；中场