WordReference Random House Unabridged Dictionary of American English © 2020
build-down  (bilddoun′),USA pronunciation n. 
  1. Governmenta process for reducing armaments, esp. 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.
  • by analogy with buildup 1980–85

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