on the case

English

Etymology

From the idea of a detective trying to solve a crime or mystery.

Prepositional phrase

on the case

1. (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.