phase-in

[ feyz-in ]

noun

1. an act or instance of phasing in; gradual introduction or implementation.

phase in

verb

1. tr, adverb to introduce in a gradual or cautious manner

   the legislation will be phased in over two years

Word History and Origins

Origin of phase-in¹

Noun use of verb phrase phase in

Idioms and Phrases

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]

Example Sentences

Following royal assent, and a one-year phase-in period, Section 13 will be history.

From The Daily Beast