spy
- A person who secretly collects information about an enemy or competitor, typically for military, political, or commercial purposes. nounThe spy was caught trying to infiltrate the enemy's headquarters.During the Cold War, many spies operated covertly in foreign countries.
- To secretly gather information about someone or something, often for espionage or intelligence purposes. verbHe was hired to spy on the rival company's activities.The agents were tasked to spy on the suspected terrorists.