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build-down

[bild-doun] /ˈbɪldˌdaʊn/
noun
1.
a process for reducing armaments, especially the number of nuclear weapons held by the U.S. and the U.S.S.R., by eliminating several older weapons for each new one that is deployed.
Origin
1980-1985
1980-85; by analogy with buildup
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Idioms and Phrases with build down

build down

Reduce, diminish, as in Owing to increased vigilance, traffic in narcotics is finally building down . This term, the antonym of build up , came into use about 1980 with regard to reducing the stockpile of nuclear weapons and soon was applied more widely.
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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