underbelly
Americannoun
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underbellies
plural
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the lower abdomen; posterior ventral area, as of an animal's body.
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the lower surface of an object; underside.
the underbelly of an airplane.
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a vulnerable area; weak point.
an attack on the soft underbelly of Europe.
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a dark, seamy, often hidden area or side.
a police officer continually exposed to the underbelly of society.
noun
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the part of an animal's belly nearest to the ground
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a vulnerable or unprotected part, aspect, or region
Other Word Forms
Noun Inflected Forms
Etymology
Origin of underbelly
Explanation
The underbelly of something is its secret weakness, something about it that's not protected from harm. Once a computer hacker discovers a network's underbelly, they're easily able to hack into it. Literally, an underbelly is just that: it's the abdomen of an animal, the soft lower belly. Often, that's also the most vulnerable part of an animal's body, since it contains major organs, and it's where the figurative meaning comes from. An alternate informal definition is "a hidden, criminal part of society," like the underbelly of a city where criminals trade stolen goods.
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:
While the now-replaced aircraft sported a blue and white exterior, the new aircraft has a navy blue underbelly, thin red stripe and blue upper body.
From Barron's ● Jun. 19, 2026
From what we've seen so far in the two gameplay trailers, the story will follow the pair in a Bonnie and Clyde-esque adventure through the seedy underbelly of America after an "easy score goes wrong".
From BBC ● Jun. 19, 2026
It also exposed the AI boom’s underbelly: the grubby sidedeals, financial anxieties, short tempers and personal vendettas that have shaped modern technology every bit as much as the march toward machine consciousness.
From The Wall Street Journal ● May 16, 2026
Lane’s Willy is both a paternal tyrant and a wounded bear, growling if anyone interrupts him yet unable to conceal his soft underbelly.
From Los Angeles Times ● Apr. 29, 2026
We bounce over a boulder so big, I hear it scrape on our underbelly.
From "Dry" by Neal Shusterman and Jarrod Shusterman
Oseguera González’s counsel responded by telling jurors they should be skeptical of key witnesses “who have made that deal with the government” — an arrangement that he called “one of the underbellies of criminal justice.”
From Los Angeles Times ● Sep. 18, 2024
With creamy white underbellies and an unmistakable crown of shaggy feathers, a Philippine eagle makes a regal impression.
From National Geographic ● Jan. 28, 2021
But its high-profile status and historical willingness to turn a blind eye to the sources of its funding offers a vivid example of these deals’ underbellies.
From Washington Post ● Oct. 16, 2018
Then there was a troop of baboons, some with babies hanging from their underbellies or riding piggyback, that took over the road like a swarm of locusts.
From New York Times ● Mar. 28, 2014
Thunder grumbled over the ocean and lightning lit the underbellies of the clouds, flashing from sea to sky and back again.
From "Ship Breaker" by Paolo Bacigalupi
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
