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Discover LudwigThe phrase "act by" is correct and can be used in written English.
You can use it to indicate that action is being taken in accordance with or in response to something. For example, "If climate change continues unchecked, governments around the world must act by implementing aggressive emission reduction targets."
Exact(60)
"This act by the I.S.A.F.
It was an act by criminals.
So act by 16 March.
The court may act by October.
An insane act by an insane man.
They have to act by themselves.
We Egyptians need to act, by ourselves and for ourselves.
It was a generous act by the Jets.
Describes show act by act, giving sample jokes.
Did he actually learn his act by watching him?
Couldn't Britain act by itself and forgive its own debts?
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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