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spies (B2)

noun

Pronunciation: /spaɪz/

People who secretly gather and report information about the plans and activities of another country, organization, or person.

The intelligence agency employed several spies to infiltrate the rival government.
During the Cold War, spies were a constant concern for both sides.
He was accused of being a spy for a foreign power.

spy on (phrasal verb): To watch someone or something secretly, especially in order to get information. — "The detective was hired to spy on the suspect."
spy for (prepositional phrase): To work as a spy for a particular country or organization. — "He was caught spying for the enemy."