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• phase-in
  phase-in

  noun

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

  verb

  (tr, adverb) to introduce in a gradual or cautious manner

phase-in

American  

[feyz-in] / ˈfeɪzˌɪn /

noun

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

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phase in British  

verb

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

   the legislation will be phased in over two years

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phase in Idioms  

1. 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]

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Etymology

Origin of phase-in

Noun use of verb phrase phase in

Example Sentences

See Examples For:

phase-in phase in

More than a dozen other states have built robust, sustainable school-choice programs on the same foundation: clear rules, sensible phase-in, fund preapprovals, and resources dedicated to core academic expenses.

From The Wall Street Journal ● Jul. 12, 2026

That three-year phase-in is to apply only to those who need to retrofit their property, not to new construction.

From Los Angeles Times ● Feb. 2, 2025

But when Seattle passed its $15-an-hour minimum wage in 2013, it gave small businesses a seven-year phase-in period to meet the goal and did so by factoring in total compensation.

From Seattle Times ● May 13, 2024

FDA proposes a phase-in of the new rules over 4 years, but its specific demands aren’t yet clear.

From Science Magazine ● Dec. 12, 2023

Important commodities - such as sugar, rice and bananas - are virtually excluded by long phase-in periods.

From The Belgian Curtain Europe after Communism by Vaknin, Samuel

"I know I have reached a certain phase in my career," Modric said recently.

From BBC ● Jul. 3, 2026

Another planned facility, Cosmic Explorer, is currently in the design phase in the United States.

From Science Daily ● Jul. 3, 2026

The commissioners plan to develop a five-year plan to phase in state funding, along with enforceable standards like caseload limits and access to defense investigators.

From Los Angeles Times ● Jun. 21, 2026

The strike marked a new phase in U.S. military action in the region, following the capture of Nicolás Maduro and a new cooperation agenda with Venezuela.

From The Wall Street Journal ● Jun. 13, 2026

“It’s taken time, I swear. I went through this whole emo phase in middle school where I played with the alias ‘Rick.’”

From "When Dimple Met Rishi" by Sandhya Menon