1 (in sport or competitions) a person who plays against sb （体育运动或比赛）对手，敌手: They are the toughest opponents we've played against. 他们是我们在比赛中遇到过的最难对付的敌手。

2 an opponent (of sth) a person who disagrees with sb's actions, plans or beliefs and tries to stop or change them 反对者: the President's political opponents 总统的政敌