half backBrE/ˈhɑːf bæk/NAmE/ˈhæf bæk/ (also half) (NAmEˈhalfback) noun[C]oneofthedefendingplayersinhockey or rugbywhosepositionisbetweenthosewhoplayatthefrontofateamandthosewhoplayattheback(曲棍球或橄榄球的)前卫 (also tail·back) [C]oneofthetwoattackingplayersinAmerican football whose position is behind the quarterback and beside the full backs(美式橄榄球的)半卫 (also tail·back) [U]thepositionahalfbackplaysat半卫的位置;中场