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The phrase "kill off" is correct and usable in written English.
You can use it to describe something being destroyed or extinguished. Example: The new law was designed to effectively kill off the inhumane practice of animal testing.
Dictionary
kill off
verb
To eliminate, or make extinct.
synonyms
Exact(60)
Sometimes they cannot kill off matches.
Are you going to kill off Brody?
Natural selection can kill off a species.
Or they kill off husbands.
Let's kill off the present!
Didn't New Age kill off the flute?
50 Finland kill off the penalty.
It didn't kill off football attendances, either.
So what did kill off the Neanderthals?
Meanwhile, Congressional Republicans are determined to kill off public financing.
One friend said: "I guess you kill off the girls".
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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