spy on

verb

spied on; spying on; spies on

: to watch (someone) secretly

He spies on his neighbors.

Have you been spying on me?

Examples of spy on in a Sentence

Recent Examples on the Web

This New Jersey home, atop a lookout spot Washington used to spy on British troops during the American Revolution, was recently listed for the fitting price. — Karissa Waddick, USA Today, 17 July 2026

Oregon Senator Ron Wyden told the Financial Times that this may be the first instance of commercially available data being used to spy on American personnel during war. — Alan Henry, PC Magazine, 17 July 2026

Humans prepare for warfare with more surveillance, taking to higher ground to gather information, conducting ambushes and raids, and quietly spying on enemy territory to avoid detection. — Laura Baisas, Popular Science, 16 July 2026

Under British rule, mail wasn’t private; postmasters could open letters to spy on colonists. — Britannica Editors, Encyclopedia Britannica, 16 July 2026

Rhymes for spy on

• anton
• argon
• axon
• baronne
• baryon
• baton
• boron
• buisson
• bygone
• capon
• cardon
• chiffon