phase out

/feɪz aʊt/
noun
  1. The process of gradually stopping the use, production, or availability of something over a period of time.
    • The government announced a phase-out of single-use plastic bags by 2025.
    • There is a planned phase-out of coal-fired power plants in the region.
    • The company's phase-out of older software will take two years.
Antonyms