phase·out | \ˈfāz-ˌau̇t \

Definition of phaseout 

(Entry 1 of 2)

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

phase 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

The ban comes after the FDA in 2015 deemed artificial trans fats to be unsafe to eat and ordered a three-year phaseout period of the ingredient. James Hohmann, Washington Post, "The Daily 202: From ‘I alone can fix it’ to ‘Congress alone can fix it,’ Trump passes the buck on family separation," 19 June 2018 Despite the phaseout in the 2015 omnibus bill, wind developers can still quality for 10 years of subsidies with startup by the end of 2023. WSJ, "Government Is Bad at Picking Energy Winners," 13 June 2018 The phaseout of the personal property tax on industrial equipment, which began in 2014 and is still being phased in, is estimated to cost about $1.3 billion. Paul Egan, Detroit Free Press, "The next big corporate tax cut? Senate panel OKs big break for utilities," 5 June 2018 Our columnist Dan Neil explains the real reason for the sedan phaseout. Gerard Baker, WSJ, "The 10-Point.," 4 May 2018 The plan is far from perfect, but the direction is now clear—a phaseout of carbon emissions.’ —Veronica Frank of Greenpeace. Costas Paris, WSJ, "Shipping Regulators Reach Deal to Cut Carbon Emissions," 13 Apr. 2018 Those include the phaseout of the personal property tax on manufacturing equipment and a $600-million-a-year general fund commitment to improve the state's roads. Paul Egan, Detroit Free Press, "Snyder cautions lawmakers to be fiscally responsible before passing tax cut legislation," 23 Jan. 2018 Perhaps a five-year Medicaid phaseout, the same growth rate as the House bill, and waivers on age rating and essential health benefits but not the community ratings that impact people with pre-existing conditions. Jim Newell, Slate Magazine, "Trumpcare Is on the March," 9 June 2017 The Greens, whose support held even compared with 2013, are demanding a phaseout of the internal combustion engine, to the consternation of Germany’s automobile industry, which employs more than 800,000 workers. William A. Galston, WSJ, "The Populist Wave Reaches Germany," 26 Sep. 2017

Recent Examples on the Web: Verb

The line can no longer be found on the store’s website and will be gradually phased out of stores in the coming months., "Ivanka Trump’s Clothing Line Pulled From Yet Another Department Store," 14 July 2018 Telangana, for instance, has introduced direct cash payments to landholders, a project that could lead to the phasing out of less efficient subsidies. The Economist, "India’s government claims to subsidise farmers, but actually hurts them," 12 July 2018 The Washington State Legislature last session enacted a phase out of open-water net-pen farming in state waters by 2025. Anchorage Daily News, "Audit finds 70 percent of British Columbia fish-processing plants do not comply with environmental regulations," 8 July 2018 For example, lead and asbestos, once common in homes and offices, have been largely phased out of many common products. National Geographic, "How the Environment Has Changed Since the First Earth Day," 21 Apr. 2018 In June, McDonald’s announced their plans to phase out plastic straws in their European stores with a possible future rollout of the policy in the U.S., BBC reports. Madison Roberts,, "Starbucks to Eliminate Plastic Straws in All Stores Worldwide," 9 July 2018 But there’s a lingering obstacle to a polio-free world: A scant number of people who got one version of the vaccine before it was phased out in 2016 carry a variant of the polio virus that was in that vaccine and has since mutated. Julia Belluz, Vox, "A vaccine we don’t even use anymore is a reason polio keeps spreading — yes, really," 4 July 2018 On businesses that make over $25 million, the rate would go from 9 percent to 13 percent, the highest business tax in the country, over Iowa’s at 12 percent, though the provision would phase out in two years. Mike Catalini,, "Murphy says he cannot sign legislators' $36.5B budget," 25 June 2018 To phase out greenhouse gases fast enough to hit the target, emissions would need to fall by about 4 percent every year, the study suggests—starting last year. Chelsea Harvey, Scientific American, "World Has Only 20 Years to Meet Ambitious 1.5-Degree C Warming Threshold," 19 June 2018

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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English Language Learners Definition of phaseout

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

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a state of commotion or excitement

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