Undercover in a Sentence 

Definition of Undercover  

involved in secret work as part of an organization,especially for espionage

Examples of Undercover in a sentence

The undercover agent is pretending to be a government official for a foreign country so he can spy on them for his own.  
An undercover spy was found in our organization, leaking our secrets to our rivals so they could use them for their own gain.  
In order to go undercover in an enemy organization, you have to convince them that you are one of them.  

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