noun. undefined

noun. A protocol followed in an emergency that involves confining people in a secure place, such as the confinement of prison inmates in cells after a disturbance, or the locking of students and teachers in classrooms after a violent attack.

noun. A situation in which this protocol is undertaken.

noun. A facility, such as a prison, where people considered to be dangerous are locked inside living quarters or otherwise confined.

noun. The confinement of people in their own rooms (or cells) as a security measure after a disturbance

noun. A contrivance to fasten logs together in rafting.

"He never really had to go into what I call lockdown."

knockdown