n
1 (a) person who sweeps 清扫者; 清洁工
*a pavement sweeper 打扫人行道的清洁工人.
(b) thing that sweeps 清扫器
*a carpet sweeper 地毯清扫器.
2 (in football) player positioned behind the defenders to tackle anyone who passes them （足球比赛的）自由中卫.

n[C]
someone or something that sweeps
　a road sweeper
BrE a football player who plays in a position behind other defending players