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