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Glite Dictionary
to phase in

to phase in

14 4.0
Introduce something slowly in stages
  • phrasal verb
  • /feɪz ɪn/
translation icon : introducir por fases
  • Under the amendment, the shift of costs to the state was supposed to phase in over six years.
  • a new phase in
  • phased in over a year
  • phased in gradually

We see that there's no virus spike in the community, and then we begin to phase in to a more normal type of training.

Examples

  • First, the higher rate structure will be phased in over three years.

    Academic text (1998)

  • The plan will be phased in gradually over the next 15 years.

    Academic text (1998)

  • As the program was being phased in, this balance was present only at the level of individual states.

    Academic text (2017)

  • The tests will be phased in over the next several years.

    Academic text (2000)

  • What I suggested is that the Saudis could gradually phase in the right for women to drive.

    Fiction book (1995)

  • We see that there's no virus spike in the community, and then we begin to phase in to a more normal type of training.

    Bedros Keuilian

  • Often, requirements are phased in over time as the regulatory program develops.

    Academic text (1999)

  • Well, we've been phasing it in over the last couple of years, yeah.

    Miracle (2004)

  • "All of this will be phased in over a five-year period," Petersen says.

    Academic text (1995)

  • The new regulations will be phased in gradually to ensure a smooth transition for all businesses.

Synonyms

to phase
vsto phase in
91 4.9

To do work in stages so it matches another plan

introduce something gradually in stages rather than all at once

Antonyms

to phase out
31 4.2

To stop using something slowly over time

How Gradual

to phase in
14 4.0
to roll out
43 3.9
to introduce
520 2.1
to launch
504 3.7

Surface Forms

phase in infinitive
phased in past
phased in past participle
phasing in present participle
phases in third person singular

Morphology

phase + in

The meaning 'to introduce gradually' is directly derivable from combining 'phase' (to do something step by step) with 'in' (into/into use); the verb denotes staged action and the particle signals movement/entry, so the composite meaning follows naturally. This composition is a common, transparent verb + particle construction and would be predictable to a B1 learner who knows both constituents.

Etymology

The verb phase in comes from the idea of a phase as a 'stage', like the moon slowly changing shape over time. So to phase in something is to bring it in slowly, 'stage by stage', rather than all at once.