collapse
Americanverb (used without object)
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to fall or cave in; crumble suddenly.
The roof collapsed and buried the crowd.
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to be made so that sections or parts can be folded up, as for convenient storage.
This bridge table collapses.
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to break down; come to nothing; fail.
Despite all their efforts the peace talks collapsed.
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to fall unconscious or as if unconscious or physically depleted, as from a stroke, heart attack, disease, or exhaustion.
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Pathology.
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to sink into extreme weakness.
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(of lungs) to come into an airless state.
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verb (used with object)
noun
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a falling in or together.
Three miners were trapped by the collapse of the tunnel roof.
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a sudden, complete failure; breakdown.
The bribery scandal brought about the complete collapse of his industrial empire.
verb
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(intr) to fall down or cave in suddenly
the whole building collapsed
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(intr) to fail completely
his story collapsed on investigation
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(intr) to break down or fall down from lack of strength
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to fold (furniture, etc) compactly or (of furniture, etc) to be designed to fold compactly
noun
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the act or instance of suddenly falling down, caving in, or crumbling
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a sudden failure or breakdown
Usage
What does collapse mean? Collapse means to break apart suddenly, as in The rickety bridge collapsed into the river. If something collapses, it falls apart or caves in quickly and suddenly. Usually, something collapses because it’s unable to support its own weight. Collapse can also be used figuratively to mean to fail or break down, as in The party quickly collapsed when two groups started fighting with each other. Collapse can also mean to fall unconscious or to pass out, as in The marathon runner collapsed due to heat stroke. Collapse can also be used as a noun in any of these senses, as in She determined that the coins dated back to the collapse of the Ottoman Empire. Example: I had to rebuild my house of cards after the wobbly table caused it to collapse.
Other Word Forms
Derived Forms
Conjugated Forms
Present
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have collapsedperfect
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has collapsedperfect 3rd person singular
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has been collapsingperfect progressive 3rd person singular
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have been collapsingperfect progressive
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am collapsingprogressive 1st person singular
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collapsingparticiple
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are collapsingprogressive
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collapsessingular 3rd person
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is collapsingprogressive 3rd person singular
Past
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had collapsedperfect
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had been collapsingperfect progressive
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was collapsingprogressive singular
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collapsedsimple
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were collapsingprogressive plural
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collapsedparticiple
Future
Etymology
Origin of collapse
First recorded in 1725–35; from Latin collāpsus “fallen together,” past participle of collābī “to fall down, fall together, fall into ruins,” from col- col- 1 + lābī “to fall, slide, make a mistake”
Explanation
To collapse means to fall over, cave in, or totally crumple. After finding out that the stock market has collapsed and your investments along with it, you'd probably collapse to the ground and sob uncontrollably. From the Latin collapsus, meaning “fall together," comes our English collapse, a word that functions as both noun and verb. Empires collapse after revolutions, and your dog will eventually collapse from exhaustion if he keeps chasing his tail in circles. But if a company falls apart after the boss retires, or you have a total breakdown cramming for exams, that's a kind of collapse, too.
Vocabulary lists containing collapse
The Great Depression and The New Deal
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"A Retrieved Reformation" by O. Henry
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Ghost Boys
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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.
In Moldova, the Russian-occupied region of Transnistria is suffering economic collapse and growing more supportive of reintegration with the rest of the country.
From The Wall Street Journal • Jun. 12, 2026
The Journal’s sports columnist leads a roundtable with acclaimed WSJ soccer correspondents Joshua Robinson and Jonathan Clegg on who’s going to win and who’s going to collapse.
From The Wall Street Journal • Jun. 11, 2026
Long before that collapse, however, hunters relied on a variety of strategies and locations to harvest bison, sometimes shifting from one site to another.
From Science Daily • Jun. 11, 2026
The researchers argue that the performance collapse seen in these experiments points to fundamental limitations in today's large language models.
From Science Daily • Jun. 10, 2026
The demise of Bear Stearns had been so unthinkable in March of 2007 that Cornwall Capital had bought insurance against its collapse for less than three-tenths of 1 percent.
From "The Big Short" by Michael Lewis
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.
