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

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.

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

Apr 1, 2026 · If you suspect someone is spying on you, here's how to detect surveillance, secure your devices, document evidence, and understand your legal options.

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

2 days ago · Both libertarians and progressives in Congress are standing in the way of renewing a key spying law that national security officials say is crucial.

Your phone is spying on you right now. We're showing you the apps that track you the most, what data they’re collecting (location, searches, contacts, browsing, and more), and why it matters.

Spies might seem like a throwback to earlier days of world wars and cold wars, but they are more common than ever—and they are targeting our nation’s most valuable secrets. The FBI is the lead...

Mar 7, 2026 · Spying can help you uncover the deepest, darkest secrets of the people around you, whether they are strangers or your older sister. If you want to be a true spy, then you have to know …

Apr 11, 2024 · The fact that a one-time ambassador was spying is bad enough, but Rocha did so undetected for some 40 years. So how big of a counterintelligence failure was that?