Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • intransitive verb To leave a scene at once; go abruptly.
  • intransitive verb To shut down automatically. Used of a nuclear reactor.
  • noun A rapid shutting down of a nuclear reactor, especially in an emergency.

from the GNU version of the Collaborative International Dictionary of English.

  • transitive verb to shut down (a nuclear reactor) quickly, as in an emergency.
  • noun the rapid shut down of a nuclear reactor, as in an emergency.
  • intransitive verb informal to leave; to go away; used mostly as an impolite command to a person to go away from a specific location.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • verb Get out of here; go away (frequently imperative).
  • verb transitive, intransitive To abruptly insert the control rods of a nuclear reactor, usually in case of emergency shutdown.
  • noun A rapid shutdown of a nuclear reactor
  • noun Alternative spelling of SCRAM.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • verb leave immediately; used usually in the imperative form

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[Perhaps short for scramble.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

Attested since 1928, originally as U.S. slang; either:

from Wiktionary, Creative Commons Attribution/Share-Alike License

Back-formation from SCRAM, most etymology are likely backronyms.

Examples

Comments

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  • Marcs in reverse. Marc is winemaking residue that can be used for distillation.

    November 2, 2007