Definition of double agent noun from the Oxford Advanced Learner's Dictionary


double agent

BrE BrE//ˌdʌbl ˈeɪdʒənt//
; NAmE NAmE//ˌdʌbl ˈeɪdʒənt//
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a person who is a spy for a particular country, and also for another country which is an enemy of the first one They couldn’t prove it, but he was almost certainly a double agent.
See the Oxford Advanced American Dictionary entry: double agent