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English definition of “phase sth in”

phase sth in

verb [T often passive] uk phrasal verb with phase   /feɪz/ us  
to introduce something gradually or in stages: They will phase the new healthcare system in over a period of five years.Creating and producingInventing, designing and innovation
(Definition of phase sth in from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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