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Destructive nuclear capacity exceeding the amount needed to destroy an enemy.
(noun)
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Excessive killing.
(noun)
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An excess of what is necessary or appropriate for a particular end: "government overkill in dealing with dissent” ( Jesse Unruh).
(noun)
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To destroy (an enemy or enemy target) with more nuclear force than necessary.
(verb-transitive)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.