phasedown

or phase-down

[ feyz-doun ]
/ ˈfeɪzˌdaʊn /

noun

an act or instance of phasing down; gradual reduction.

Origin of phasedown

First recorded in 1965–70; noun use of verb phrase phase down
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019