opponent
n. 对手，竞争者；反对者，阻止者
adj. 对立的，敌对的
例句
The boxer jabbed at his opponent.
拳击手向对手猛击。
《牛津词典》
In debate he was a formidable opponent.
在辩论中他是位难应付的对手。
He felled his opponent with a single blow.
他一拳击倒了对手。
