- [countable]
one of the defending players in football (soccer), hockey or rugby whose position is near the goal they are defending. In soccer, they play on the left and right sides of the field. （足球、曲棍球或橄榄球）后卫 - [countable]
the attacking player in American football whose position is behind the quarterback and next to the half backs （美式足球）全卫 - [uncountable]
the position a full back plays at 后卫位置