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Discover Ludwig"Case closed" is correct and can be used in written English
It is typically used to denote that a situation has been resolved and may not be further discussed or investigated. For example, "The detective determined that the suspect was innocent. Case closed."
Dictionary
Case closed
phrase
The above is meant as final, not subject to amendation or variation.
Exact(56)
Case closed.
Case closed, I'd say.
"Case closed!" he thundered.
Case closed again.
Case closed, right?
Case closed, he felt.
Case closed, it would seem.
Case closed, say the secularists.
Case closed: Walter Sickert was Dracula.
Case closed for the suicide contingent.
Case closed: You don't argue with the queen.
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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