Meaning of the word "be on the case" in English

What does "be on the case" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

be on the case

US /bi ɑn ðə keɪs/
UK /bi ɑn ðə keɪs/
"be on the case" picture

Idiom

1.

to be investigating or dealing with a problem or situation

Example:
Don't worry about the missing documents, I'm on the case.
The detective assured them he would be on the case immediately.
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