underpin

American  

[uhn-der-pin] / ˌʌn dərˈpɪn /

verb (used with object)

• underpins,
  present (3rd person singular)
• underpinned,
  past participle,  past
• underpinning
  present participle

1. to prop up or support from below; strengthen, as by reinforcing a foundation.

2. to replace or strengthen the foundation of (a building or the like).

3. to furnish a foundation for; corroborate.

   The author's conclusions are underpinned by references to experimental findings.

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underpin British  

/ ˌʌndəˈpɪn /

verb

1. to support from beneath, esp by a prop, while avoiding damaging or weakening the superstructure

   to underpin a wall

2. to give corroboration, strength, or support to

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Other Word Forms

Inflected Forms

Participles

• underpinning
  present
• underpinned
  past

Conjugated Forms

Present

• underpin
  simple
• underpins
  simple
• have underpinned
  perfect
• has underpinned
  perfect
• am underpinning
  progressive
• are underpinning
  progressive
• is underpinning
  progressive
• have been underpinning
  perfect progressive
• has been underpinning
  perfect progressive

Past

• underpinned
  simple
• had underpinned
  perfect
• was underpinning
  progressive
• were underpinning
  progressive
• had been underpinning
  perfect progressive

Future

• will underpin
  simple
• will have underpinned
  perfect
• will be underpinning
  progressive
• will have been underpinning
  perfect progressive

Etymology

Origin of underpin

First recorded in 1515–25; under- + pin

Explanation

To underpin is to justify or support the ideas behind something, the way your extensive research underpins your self-published book on ice cream trucks in the United States. Whenever you substantiate someone's claims, theories, or stories, you underpin them. A slightly different way to underpin is to form the basis or foundation of something: "A philosophy of empathy and kindness underpins all the interactions at my wonderful summer camp." This verb can also be used in a more literal way, to mean "support from below," the way the foundation of a house underpins everything that's built on top of it.

Example Sentences

See Examples For:

underpin underpins underpinned underpinning

But when these topics underpin a massive, sold-out festival of music with an audience of young women, it becomes “part of ordinary civic life,” she said.

From Los Angeles Times ● Aug. 27, 2026

Household spending in Canada has remained relatively resilient, helping underpin an economy that has shown signs of rebounding following back-to-back quarterly contractions.

From The Wall Street Journal ● Aug. 27, 2026

“ByteDance respects the intellectual property rights that underpin creative industries around the world, and we believe responsible innovation in AI goes hand in hand with meaningful protections for rightsholders,” ByteDance’s Rogovin said in the statement.

From Los Angeles Times ● Aug. 17, 2026

China is shifting from producing cheap consumer goods to exporting higher-value intermediate and capital goods that underpin global manufacturing.

From The Wall Street Journal ● Aug. 7, 2026

The AIG FP traders present were shocked by how little thought or analysis seemed to underpin the subprime mortgage machine: It was simply a bet that home prices would never fall.

From "The Big Short" by Michael Lewis

The pact underpins $1.6tn in North American trade.

From BBC ● Aug. 24, 2026

“CoreWeave’s combination of market leadership, execution against a rapidly growing backlog and accelerating profitability underpins our positive outlook,” Liani wrote.

From MarketWatch ● Aug. 14, 2026

But earnings season is reassuring many that a strong core of corporate profitability underpins the market’s gains.

From The Wall Street Journal ● Aug. 9, 2026

Space infrastructure underpins some 20 percent of the UK economy, said Archer.

From Barron's ● Aug. 7, 2026

When the experimental method is successful in explaining what was previously inexplicable, it thus not only establishes particular scientific theories, it also confirms the validity of the general approach which underpins experimentation.

From "The Invention of Science" by David Wootton

Analysts at Citi said they expect a “robust” 30 trillion won per quarter dividend to be sustained, backed by the secular memory market outlook that’s underpinned by long-term agreements.

From MarketWatch ● Aug. 24, 2026

She noted that Europe had long benefitted from "three pillars" -- a rules-based global order underpinned by US security guarantees, cheap energy and expanding global trade.

From Barron's ● Aug. 19, 2026

This discipline underpinned earnings growth despite revenue falling over the 12 months through December, but the analysts point to weak growth in postpaid subscribers and a creep in capital expenditure as reasons for caution.

From The Wall Street Journal ● Aug. 14, 2026

"It will require primary legislation underpinned by a complex international agreement which would take several years to agree."

From BBC ● Aug. 12, 2026

The frilled skirt was underpinned with buckram to make it flare.

From "The God of Small Things" by Arundhati Roy

One of the most common assumptions underpinning the “Gen Z doesn’t drink” narrative is that young adults simply don’t want to go out anymore.

From Salon ● Aug. 15, 2026

“The ‘Full Fare Rule’ is a vital underpinning of modern flight shopping and must not be repealed or watered down in any way,” wrote Jason Rabinowitz on July 8.

From Los Angeles Times ● Aug. 14, 2026

He added that Agile has signed customer contracts underpinning this year’s projected revenue and has so far raised about $1.5 billion from investors led by SoftBank Group 9984 1.84%increase; green up pointing triangle .

From The Wall Street Journal ● Aug. 3, 2026

Fifpro added that such a move "would fundamentally and irreversibly reshape the incentives underpinning the competitions" and it was "particularly troubling that a project of this magnitude has been developed largely behind closed doors".

From BBC ● Jul. 30, 2026

In the recognition by Pythagoras and Plato that the Cosmos is knowable, that there is a mathematical underpinning to nature, they greatly advanced the cause of science.

From "Cosmos" by Carl Sagan