Phase out

//feɪ̯z äʊ̯t// verb

Definitions

Verb
  1. 1
    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). transitive

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

  2. 2
    terminate gradually wordnet

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