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Verb: phase out
  1. Terminate gradually
    "They plan to phase out the old software system"
Noun: phase-out
  1. The act or instance of a planned discontinuation
    "The phase-out of incandescent light bulbs was part of an energy-saving initiative"

Derived forms: phases out, phasing out, phased out, phase-outs

Type of: discontinuance, discontinuation, end, terminate

Antonym: phase in