throw away the key
Definition from Wiktionary, the free dictionary
An ellipsis of "lock (someone) up and throw away the key" (to incarcerate indefinitely)
- To never release someone (e.g., from prison).
- They should just lock them up and throw away the key.
1995 November 19, “Senators Pete Domenici and John Breaux Discuss the Shutdown of the Federal Government”, in CBS_FaceNation:
- Let's get these men together in a room and I would suggest feed them bread and water and throw away the key until they come together