phase in

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phase in

To introduce or implement (someone or something) gradually to some new function, condition, or situation, especially in distinct phases or stages. We've been phasing in a new company-wide policy to help deal with cyber security threats. The program was phased in over a period of seven years, with the final implementation going live today. They said they would phase me in slowly when they first offered the job to me, but that hasn't been the case at all.
See also: phase

phase in

Introduce one stage at a time. For example, New technology must be phased in or the office will be overwhelmed. The antonym is phase out, meaning "to bring or come to an end, one stage at a time," as in The department is phasing out all the older computers. [Mid-1900s]
See also: phase

phase in

v.
To introduce something or someone gradually or in stages: The government is now phasing in a new immigration policy. We should phase the new regulations in slowly so that businesses can get used to them.
See also: phase