phase·​out | \ ˈfāz-ˌau̇t How to pronounce phaseout (audio) \

Definition of phaseout

 (Entry 1 of 2)

: a gradual stopping (as in operations or production) : a closing down by phases

phase out

phased out; phasing out; phases out

Definition of phase out (Entry 2 of 2)

transitive verb

: to discontinue the practice, production, or use of by phases

intransitive verb

: to stop production or operation by phases

Examples of phaseout in a Sentence

Recent Examples on the Web: Noun But the latter is likely to be more contentious given that, as a Department of Energy report concluded last month, the rapid phaseout of fossil fuel power plants would carry a disproportionate economic burden on a handful of coal-reliant states. Tim Mcdonnell, Quartz, "Biden’s first climate regulation is supported by industry groups and Republicans," 4 May 2021 That fast phaseout—on top of existing tax rates and phaseouts of other tax breaks—would effectively create very high marginal tax rates for those households. Andrew Duehren, WSJ, "Democrats to Change Eligibility for Stimulus Checks in Covid-19 Aid Bill," 3 Mar. 2021 For couples filing jointly, the phaseout starts for those making $150,000 and cuts off at $160,000. Michael Collins, USA TODAY, "Coronavirus relief checks sent to 90 million Americans in initial round of payments, the IRS says," 18 Mar. 2021 That phaseout could be lowered by $25,000 to save $50 billion on the bill. Tim Fernholz, Quartz, "How to make the US stimulus better," 23 Feb. 2021 The good news is that total toxicity plummeted more than 95% for birds and mammals from 1992 to 2016, the team reports today in Science, largely because of the phaseout of older pesticides. Erik Stokstad, Science | AAAS, "Birds versus bees: These species are losing out in the great pesticide trade-off," 1 Apr. 2021 Health and Human Services Secretary Marylou Sudders said at the hearing the state was taking steps to address the threat caused by variants, including delaying the phaseout of the state’s contact tracing operation., "441 cases of the British coronavirus variant detected in Mass.," 24 Mar. 2021 For couples filing jointly, the phaseout would start for those making $150,000 and cut off at $160,000. Michael Collins, USA TODAY, "$1,400 checks could start arriving within weeks under latest COVID-19 relief package," 8 Mar. 2021 Instead, Democrats and President Biden have agreed to a quicker income phaseout of the next round of $1,400 stimulus checks, which will be capped at individuals earning $80,000 annually. Susan Ferrechio, Washington Examiner, "Democrats tighten stimulus check limits in bid to smooth passage of $1.9 trillion spending bill," 3 Mar. 2021 Recent Examples on the Web: Verb Part of the problem has been the government’s cumbersome two-tier currency system, which was formally ended in January, although the phase out is not yet complete. Jon Lee Anderson, The New Yorker, "Cuba After the Castros," 28 Apr. 2021 Couples earning more than $160,000 will phase out of a payment. Washington Post, "What you need to do to get the third stimulus payment of up to $1,400," 7 Mar. 2021 In mid-November, the German supreme court ruled that Merkel’s strategy to phase out of nuclear energy by 2022—a test case for phasing out coal plants as well—was unconstitutional. Edna Bonhomme, The New Republic, "The Global Temptation to Keep Building Pipelines," 2 Dec. 2020 Singer said the health department’s plan is to phase out its mass testing site at Carroll County Agriculture Center in the next month. Pat Stoetzer,, "While COVID-19 ‘still a struggle,’ Carroll County’s case rates down as vaccination numbers growing," 22 Apr. 2021 The letter, addressed to President Joe Biden and others attending Biden's virtual climate summit, urges world leaders to phase out fossil fuels to curb the climate crisis. Aj Willingham, CNN, "5 things to know for April 21: Chauvin trial, coronavirus, infrastructure, Russia and China, Chad," 21 Apr. 2021 The state plans to phase out many pandemic restrictions affecting businesses next month, including long-shuttered bars, while keeping the mandatory indoor mask-wearing rules in place for now, Democratic Gov. Ned Lamont announced Monday. From Usa Today Network And Wire Reports, USA TODAY, "Coronavirus pinatas, cathartic effigy, immigration limbo: News from around our 50 states," 21 Apr. 2021 Wednesday night, Hockaday’s trustees voted to phase out the school’s boarding program — which has housed students for more than a century — over the next four years. Valeria Olivares, Dallas News, "Students, alumnae urge Hockaday to keep century-old boarding program," 19 Apr. 2021 The payments will start to phase out above those levels with the $400,000 and $200,000 caps still in place. Leada Gore |, al, "Stimulus update: Who will start getting $300 monthly payments in July?," 16 Apr. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'phaseout.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of phaseout


1951, in the meaning defined above


1940, in the meaning defined at transitive sense

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The first known use of phaseout was in 1940

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Last Updated

14 May 2021

Cite this Entry

“Phaseout.” Dictionary, Merriam-Webster, Accessed 17 May. 2021.

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English Language Learners Definition of phaseout

US : the act of stopping something gradually over a period of time in a planned series of steps or phases

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