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The phrase "threatened to" is correct and can be used in written English.
It means to use intimidation or a warning to make someone do something. Example: The gang leader threatened to hurt anyone who didn't obey him.
Exact(60)
Lawyers threatened to sue.
They never threatened to.
Clay threatened to sue.
Hunger threatened to precipitate mutiny.
Mr. Ackman threatened to sue.
Or threatened to come back?
He threatened to quit prospecting.
D.S.K. threatened to sue him.
Russia has threatened to retaliate.
They never threatened to attack.
It threatened to "return fire for fire".
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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