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build-down

[bild-doun]
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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.
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Origin of build-down

First recorded in 1980–85; by analogy with buildup
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018