scram

Short definition from Wiktionary

Verb

1. 1
   To leave in a hurry; to go away.
2. 2
   To shut down (a nuclear reactor or, by extension, some other thing) for safety reasons, usually because of an emergency.
3. 3
   Of a nuclear reactor or some other thing: to shut down, usually because of an emergency.
4. 4
   To scratch (something) with claws or fingernails; to claw.
5. 5
   To mine for ore on a small scale, especially from mines previously been worked on where most of the ore is believed to have been removed.
6. 6
   Of one's body or limbs: to become numb or stiff due to cold, lack of movement, etc.
7. 7
   To be weakened by an accident, a disease, starvation, etc.
8. 8
   Alternative letter-case form of scram.

Noun

1. 1
   A gun, firearm.
2. 2
   A shutdown of a nuclear reactor (or, by extension, some other thing), often done rapidly due to an emergency.
3. 3
   The device used to shut down a nuclear reactor; also, the button or switch used to initiate a shutdown.
4. 4
   A scratch, especially caused by claws or fingernails.
5. 5
   A mine previously worked on where most of the ore is believed to have been removed, but which is still being mined on a small scale.
6. 6
   Alternative letter-case form of scram.