To eliminate or discontinue something gradually over time through a planned, systematic reduction rather than immediate termination.
Adopted from military and engineering contexts where 'phases' referred to distinct stages of operations or development. The business usage emerged in the mid-20th century, emphasizing planned obsolescence and managed transitions rather than abrupt changes that could cause disruption.
Phase out reflects sophisticated organizational thinking about change management - the recognition that sudden elimination can create shock waves, while gradual removal allows stakeholders to adapt. However, 'phase out' can sometimes become a euphemism that obscures the reality of elimination, making difficult decisions seem more palatable than they actually are.
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