on the case

== English == === Etymology === From the idea of a detective trying to solve a crime or mystery. === Prepositional phrase === on the case (informal) Actively working on something. Synonym: on it Near-synonym: on the job ==== Further reading ==== “on the case” (US) / “on the case” (UK) in Macmillan English Dictionary. “be on the case”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present. “be on the case” in Longman Dictionary of Contemporary English, Longman.