sweeper

sweeper
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.

牛津英汉双解词典