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The phrase "on the case" is correct and commonly used in written English. It is often used to describe someone who is actively working on a problem or investigation. For example: "Our team is on the case and we will have a solution to the issue by the end of the day." This phrase can also be used in a more casual context, such as "Don't worry, I'm on the case and I'll find the best restaurant for our date." In both cases, "on the case" implies that the person is focused and determined to solve the problem or complete the task at hand.
Idiom
On the case.
If someone is on the case, they are dealing with a problem.
Exact(58)
Almost no one is on the case.
Here's more on the case.
LIZADONNELLY: Peta is already on the case.
Mail Online is on the case.
Cordes went to work on the case.
MI5 declined to comment on the case.
Ortiz has not commented on the case.
The glass on the case is unbroken.
No actual movement on the case, however.
Oracle is also on the case.
Rosen declined to comment on the case.
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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