underpin

verb

un·​der·​pin ˌən-dər-ˈpin 

underpinned; underpinning; underpins

transitive verb

1

: support, substantiate

underpin a thesis with evidence

2

: to form part of, strengthen, or replace the foundation of

underpin a structure

underpin a sagging building

Synonyms of underpin

• sustain
• carry
• support
• bolster

Examples of underpin in a Sentence

a wall underpinned by metal beams

the central beliefs that underpin a free society

Recent Examples on the Web

On one side of the debate are fears that older chips, which serve as collateral for billions of dollars of borrowing by neoclouds like CoreWeave and underpin data-center deals, will become obsolete and decline in value. — Reed Albergotti, semafor.com, 15 Sep. 2026

And the looming reality underpinning all of it is that, at some point between now and 2030, some (not all) of the current main characters, the faces of the program, could begin to fade. — Henry Bushnell, New York Times, 15 Sep. 2026

Financing remains an important consideration for projects, Simonelli said, but rising energy needs from population growth, industry and data centers continue to underpin investment. — Lee Ying Shan, CNBC, 14 Sep. 2026

Interventions can include removing trees and vegetation or constructing barriers to isolate their roots from the house’s foundations and, at the more extreme and expensive end, underpinning the house by pumping concrete beneath the foundations. — Laura Paddison, CNN Money, 11 Sep. 2026

Word History

First Known Use

1522, in the meaning defined at sense 1

Rhymes for underpin

• aneurin
• crystallin
• eosin
• mandolin
• porphyrin
• superfine
• vietminh
• violin
• akin
• auxin
• buckskin
• chagrin

Kids Definition

underpin

verb

un·​der·​pin -ˈpin 

1

: to give support to

underpin an argument with evidence

2

: to form part of, strengthen, or replace the foundation of

underpin a structure