double agent

noun
1.
a person who spies on a country while pretending to spy for it.
2.
a spy in the service of two rival countries, companies, etc.

Origin:
1930–35

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
double agent
 
n
a spy employed by two mutually antagonistic countries, companies, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
There were rumors there might be a third double agent.
Sparkling in his role as a conscience-struck double agent, he fights intrigue and physical danger to triumph in the end.
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