phase out

• enPR: fāz out, IPA^(key): /feɪ̯z äʊ̯t/

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phase out (third-person singular simple present phases out, present participle phasing out, simple past and past participle phased out)

1. (transitive) To remove or relinquish the use of (something) little by little, either via discrete diminishing phases or (by extension) by continuous gradations; to remove in phases, or as if by phases (gradually).

   Synonym: sunset

   Antonym: phase in

   Coordinate term: phase down

   Leaded petrol was phased out in the course of the 1990s.

   • 2023 August 9, “Network News: Network Rail under fire for spending thousands of pounds on flights”, in RAIL, number 989, page 15:

     It [Greenpeace] also says that tax exemptions should be phased out for airlines, including the opt-outs that low-cost carriers currently have from paying VAT or fuel duty on kerosene.

   • 2023 December 14, Damian Carrington, quoting Michael E. Mann, “Failure of Cop28 on fossil fuel phase-out is ‘devastating’, say scientists”, in The Guardian‎, →ISSN:

     “The lack of an agreement to phase out fossil fuels was devastating,” said Prof Michael Mann, a climatologist and geophysicist at the University of Pennsylvania in the US.

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