
Be on the case
Colloquial Use
Used in everyday conversation, not in formal settings.

The sink is leaking again? I'm on the case!
Taking Action
Implies the speaker is not just aware but actively working to solve the issue.

You forgot the meeting notes? Don't worry, I'm on the case.
Reassurance
Often used to reassure someone that their concern is being addressed.

Missing shipment? Relax, I'm on the case and will find it.
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