phaseout

1 of 2

noun

phase·​out ˈfāz-ˌau̇t 

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

phase out

2 of 2

verb

phased out; phasing out; phases out

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

For married couples filing jointly, the phaseout begins at $170,000. —Annie Nova, CNBC, 29 Nov. 2025

And the threats to the sector may also be overstated: Details of the South Korean phaseout of biomass subsidies have not yet been released, despite being announced in February. —Nithin Coca, semafor.com, 28 Oct. 2025

Verb

For example, the new $40,000 SALT deduction begins to phase out for filers with annual income of more than $500,000. —Aimee Picchi, CBS News, 25 Nov. 2025

After 10 years of the Paris Climate Agreement, new national commitments to cut greenhouse gases were due and momentum was building for an international plan to phase out the world’s use of fossil fuels. —Jeff Young, MSNBC Newsweek, 25 Nov. 2025

Word History

First Known Use

Noun

1951, in the meaning defined above

Verb

1940, in the meaning defined at transitive sense

Rhymes for phaseout

• roundabout
• runabout
• sauerkraut
• thereabout
• turnabout
• about
• bailout
• blackout
• blowout
• breakout
• burnout
• buyout

Kids Definition

phase out

verb

: to discontinue doing, producing, or using

phasing out old machinery