Spy on Meaning in English
expression
Definition
To secretly watch or listen to someone or something, usually to get information without their knowledge.
Usage & Nuances
Informal or neutral; often used about government, parents, or suspicious partners. Commonly followed by the person/object: 'spy on neighbors.' Implies secrecy and lack of consent. Not interchangeable with 'spy for' (which means to work as a spy on behalf of someone).
Example Sentences
He tried to spy on his sister to see what she was doing.
basic
Governments sometimes spy on people to gather information.
basic
You should not spy on your friends.
basic
My neighbor keeps trying to spy on me through the window.
natural
Were you trying to spy on our conversation just now?
natural
Kids these days are so tech-savvy, they know how to spy on each other online.
natural