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English definition of “be on the case”

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."Taking part and getting involvedGetting involved for one's own benefit or against others' will
(Definition of be on the case from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

Definitions of “be on the case” in other dictionaries

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