Spy
/spˈaɪ/
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Definition
(noun) A person who secretly watches and examines the actions of other individuals or organizations and gathers information on them (usually to gain an advantage).
Sentence Examples
You aren't a spy, are you?
White was denounced to the police as a spy.
CEFR Practice Quiz
The secret agent worked as a ____ deep undercover to gather information about the enemy's plans.