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Discover LudwigThe phrase "tightly guarded" is correct and usable in written English.
You can use it in sentences that describe someone or something being particularly guarded or heavily protected, e.g. "The President entered the room under tightly guarded security."
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Not everything was a smash, but she did discover one tightly guarded national secret: Swiss wine.
That in theory should be a tightly guarded gateway to the world of respectable business.
In his tightly guarded world, his motto was "Silence, silence, and more silence".
Nearly all of them fled through China because the North-South border is tightly guarded.
If they are tightly guarded in the United States and Russia, the danger is minimal.
Many stores change designs every month and keep their techniques a tightly guarded secret.
Mr. Hwang has led a tightly guarded life in Seoul, surrounded by government security agents.
(Beatles projects are typically tightly guarded; few outside EMI have heard the remasters yet).
Trussoni describes it in terrifying terms: a tightly guarded panopticon, "a glass honeycomb, each cell crawling with an angry wasp".
Information about the Gandhi family is tightly guarded, but Mrs. Gandhi is not known to suffer from any major illnesses.
Who will then light the cauldron – the same one that was used for the Olympics – remains a tightly guarded secret.
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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