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prolong

American  
[pruh-lawng, -long] / prəˈlɔŋ, -ˈlɒŋ /

verb (used with object)

prolongs, present (3rd person singular) prolonged, past participle, past prolonging present participle
  1. to lengthen out in time; extend the duration of; cause to continue longer.

    to prolong one's stay abroad.

    Antonyms:
    abbreviate
  2. to make longer in spatial extent.

    to prolong a line.


prolong British  
/ prəˈlɒŋ, ˌprəʊlɒŋˈɡeɪʃən /

verb

  1. (tr) to lengthen in duration or space; extend

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Synonym Usage

See lengthen.

Other Word Forms

Derived Forms

Inflected Forms

Participles

Conjugated Forms

Present

Past

Future

Etymology

Origin of prolong

First recorded in 1375–1425; late Middle English prolongen, from Late Latin prōlongāre “to lengthen,” equivalent to prō- “forward, forth” + long(us) “long” + -ā- theme vowel + -re infinitive ending; see pro- 1, long 1

Explanation

I don't want to prolong this definition, so I'll keep it short. To prolong is to make something last longer or to stretch it out in time. You see the word long in prolong and it's no trick. If you prolong an argument with a sibling, you make it longer than it naturally would be. Prolong always has to do with time. When you stretch your neck or a piece of cloth to make it appear longer, you are elongating, not prolonging, it.

Keep Reading on Vocabulary.com

Vocabulary lists containing prolong

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

A permanent position would reassure markets of policy continuity, while a temporary role could prolong uncertainty and leave the burden of maintaining stability to her eventual successor, they said.

From The Wall Street Journal Jul. 27, 2026

Hotter nights can prolong the stress that heat places on the human body by depriving people of a chance to recover, increasing the risk of heat-related illness.

From Los Angeles Times Jul. 22, 2026

The free-hitting Russian, 28, was rewarded for his persistence when he took his first set in four meetings with former world number one Djokovic to prolong the contest beyond the three-hour mark.

From BBC Jul. 5, 2026

“The near closure of the Strait continues to prolong a disruption that is steadily tightening global energy markets,” said Ole Hansen, head of commodity strategy at Saxo Bank.

From Barron's Apr. 29, 2026

Then I try to cover for myself, and prolong my time with her.

From "Every Day" by David Levithan

It prolongs an earlier easing of sanctions that expired on April 11.

From Barron's Apr. 22, 2026

“To deny that only prolongs the situation and puts off any way of reckoning with it. We have to face it in order to understand that it’s within our human nature.”

From The Wall Street Journal Apr. 1, 2026

“Dying intestate in California often prolongs the probate process, increasing legal and court fees,” the law firm says.

From MarketWatch Dec. 6, 2025

"Our strategy not only minimizes cytokine-induced harm to healthy cells, but also prolongs cytokine retention within the tumor," Tong said.

From Science Daily Apr. 19, 2024

Her lightness prolongs both our suffering but it is my safety since he has great speed that he has never yet employed.

From "The Old Man and The Sea" by Ernest Hemingway

Executives later said the prolonged legal battle hampered the company’s ability to compete, particularly as streaming rivals accelerated their investments.

From The Wall Street Journal Jul. 27, 2026

The pipeline and oil fields themselves are undamaged, but a prolonged cut to production would jeopardize the company’s substantial cash flow from the region.

From The Wall Street Journal Jul. 25, 2026

Thames Water has implemented a temporary usage ban for 10.1 million customers due to a high demand for water, as a result of recent heatwaves and prolonged dry weather in the spring and summer.

From BBC Jul. 25, 2026

The European Union has deployed aircraft and helicopters to support firefighting efforts in Spain and France, as much of southern Europe grapples with repeated heatwaves and prolonged drought.

From BBC Jul. 24, 2026

When the prolonged shaking knocked out power lines, backup generators clicked on to run the plant’s instrument panels and keep critical coolant moving through the reactors.

From "Meltdown" by Deirdre Langeland

The 24-year-old has said he is open to prolonging his own stay.

From BBC Mar. 30, 2026

For one thing, a generous tax break for buying electric vehicles expired last fall, prolonging a slump in sales of nonfuel cars.

From MarketWatch Feb. 4, 2026

A 15-percent US tariff and higher duties for other key markets such as India risk prolonging weak prices and further squeezing margins, the ministry said, calling it a "source of concern".

From Barron's Jan. 21, 2026

As a result, the roles were filled by officers who had had to juggle “other duties besides background investigations” — thereby prolonging the time it took to review an applicant’s background, she said.

From Los Angeles Times Dec. 27, 2025

The executive wondered if they were enjoying prolonging this encounter.

From "Scythe" by Neal Shusterman

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