double agent

noun
🔊/ˌdʌbl ˈeɪdʒənt/
🔊/ˌdʌbl ˈeɪdʒənt/
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  1. a person who is a spy for a particular country, and also for another country that is an enemy of the first one双重间谍
    • They couldn’t prove it, but he was almost certainly a double agent.他们虽不能证明,但基本肯定他是个双重间谍。