a person whose job is to sweep something 打扫者；清扫者；清洁工 a road sweeper 马路清洁工
a thing that sweeps something 清扫器；清洁器 a carpet sweeper 地毯清洁器
(in football (soccer) 足球 a player who plays behind the other defending players in order to try and stop anyone who passes them 自由中卫；清道夫