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

1.
menguruskan masalah, menangani kes
to be investigating or dealing with a problem or situation
:
•
Don't worry about the missing documents, I'm on the case.
Jangan risau tentang dokumen yang hilang, saya sedang menguruskannya.
•
The detective assured them he would be on the case immediately.
Detektif itu memberi jaminan bahawa dia akan segera menguruskan kes itu.