someone who competes with or fights another in a contest, game, or argument; a rival or adversary
对手;敌手
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he beat his Republican opponent by a landslide margin .他以绝对多数击败了他的共和党对手。
a person who disagrees with or resists a proposal or practice
反对者
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an opponent of the economic reforms .经济改革的反对者。
"late 16th cent. (denoting a person opening an academic debate by proposing objections to a philosophical or religious thesis): from Latin