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Discover LudwigThe phrase "one fell swoop" is correct and commonly used in written English.
It means to do something all at once or in a single action, usually with a negative connotation. Example: "The company's new policies were announced and implemented in one fell swoop, causing outrage among employees."
Dictionary
one fell swoop
noun
One stroke; one action or event with many results.
Exact(54)
"Everything has changed in one fell swoop.
"It met everybody's objectives in one fell swoop," Knapp said.
It's the ordinary and the extraordinary in one fell swoop".
All your experienced people will go in one fell swoop.
In one fell swoop they have kept a key manager".
From con to consultant in one fell swoop.
Similar(5)
It celebrated and undermined giallo in one fell swoop.
Much of it should come off in one fell swoop.
In one fell-swoop.
But it could not be done in one fell swoop...I am leaving.
Observed violations of these relations would falsify all PPN models in one fell swoop.
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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