Leave in a hurry, go away.
What are you kids doing on my lawn? Scram!
The emergency shutdown device of a nuclear reactor, originally specifically by insertion of one or more safety control rods.
An activation of the emergency shutdown of a nuclear reactor.
(by extension) Any emergency shutdown.
To use the shutdown or safety device of a nuclear reactor.
(by extension) To use any emergency shutdown.
A scratch, especially caused by claws or fingernails.
Scratch with claws or fingernails.