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"spy on" is a correct and usable phrase in written English.
It is often used to mean to secretly observe someone or something to gain information. Example: The FBI has been accused of spying on the opposition party's campaign headquarters.
Dictionary
spy on
verb
To secretly watch; to surveil.
Exact(60)
"Helps us spy on our citizens better".
"No-one can spy on you.
You don't spy on partners".
I didn't spy on people.
"We can spy on you.
To spy on their owners?
Friends don't spy on friends.
We Spy On Everyone.
Someone still wants to spy on us!
There's a spy on the loose!
Will Alabama use a "spy" on Golson?
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com