Meaning of “be on the case” in the English Dictionary

british dictionary

"be on the case" in British English

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be on the case

informal

to be doing what needs to be done in a particular situation:

"We need to book a flight before it's too late." "Don't worry, I'm on the case."

(Definition of “be on the case” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)