Espionage, spying, or intelligence gathering, as a subfield of the intelligence field, is the act of obtaining secret, confidential, or in some way valuable information.

The meaning of SPY is to watch secretly usually for hostile purposes. How to use spy in a sentence.

Phrasal verb spy on someone/something (Definition of spying from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

1. To engage in espionage. 2. To investigate or observe something, especially in secret: spying into the neighbor's activities.

Espionage is defined as the act of spying or using spies, agents, assets, and intelligence officers, as well as technology, to collect secret information, usually through illegal means.

/ˈspaɪɪŋ/ IPA guide Other forms: spyings Definitions of spying noun keeping a secret or furtive watch see more

5 days ago · From face scans, phones, and fingerprints to bulk data collection, here's how modern surveillance is reshaping (and watching) your life.

Spying is the act or process of finding out secret information for a country or organization about other countries or organizations. ...a ten-year sentence for spying.

Nov 7, 2025 · Following the surrender of Nazi Germany in May 1945 near the close of World War II, the uneasy wartime alliance between the United States and Great Britain on the one hand and the Soviet …

Jun 16, 2025 · Discover 25 intriguing facts about the concept and history of spying, from ancient espionage tactics to modern intelligence operations.