1 [skram]
verb (used without object), scrammed, scramming. Informal.
to go away; get out (usually used as a command): I said I was busy, so scram.

1925–30; probably shortened form of scramble (but compare German schramm, imperative singular of schrammen to depart) Unabridged


2 [skram] Informal.
the rapid shutdown of a nuclear reactor in an emergency.
verb (used with object)
to shut down (a nuclear reactor) rapidly in an emergency.

1945–50; perhaps identical with scram1, though sense development is unclear Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scram1 (skræm)
vb , scrams, scramming, scrammed
informal (intr; often imperative) to go away hastily; get out
[C20: shortened from scramble]

scram2 (skræm)
1.  an emergency shutdown of a nuclear reactor
2.  (of a nuclear reactor) to shut down or be shut down in an emergency
[C20: perhaps from scram1]

scramb or scram (skræm)
dialect (Brit) (tr) to scratch with nails or claws
[from Dutch schrammen]
scram or scram
[from Dutch schrammen]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1928, U.S. slang, either a shortened form of scramble (q.v.) or from Ger. schramm, imperative sing. of schrammen "depart."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Did they recover the scram jet or is it in the ocean.
And do not overlook scram jets which have dropped out of the news for a couple of years.
Virtually everyone in the state is telling him to scram, but he's not taking the hint.
Being told to scram by a large media outlet is not a good feeling.
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