clump
Americannoun
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a small, close group or cluster, especially of trees or other plants.
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a lump or mass
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a heavy, thumping step, sound, etc.
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Immunology. a cluster of agglutinated bacteria, red blood cells, etc.
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a thick extra sole on a shoe.
verb (used without object)
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Also clomp to walk heavily and clumsily.
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Immunology. to gather or be gathered into clumps; agglutinate.
verb (used with object)
noun
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a cluster, as of trees or plants
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a dull heavy tread or any similar sound
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an irregular mass
a clump of hair or earth
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an inactive mass of microorganisms, esp a mass of bacteria produced as a result of agglutination
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an extra sole on a shoe
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slang a blow
verb
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(intr) to walk or tread heavily
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to gather or be gathered into clumps, clusters, clots, etc
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to cause (bacteria, blood cells, etc) to collect together or (of bacteria, etc) to collect together
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slang (tr) to punch (someone)
Other Word Forms
Derived Forms
Inflected Forms
Nouns
Participles
Conjugated Forms
Present
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clumpsimple
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clumpssimple
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have clumpedperfect
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has clumpedperfect
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am clumpingprogressive
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are clumpingprogressive
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is clumpingprogressive
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have been clumpingperfect progressive
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has been clumpingperfect progressive
Past
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clumpedsimple
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had clumpedperfect
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was clumpingprogressive
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were clumpingprogressive
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had been clumpingperfect progressive
Future
Etymology
Origin of clump
First recorded in 1580–90; akin to Dutch klompe “lump, mass,” Old English clympre “lump of metal”
Explanation
A clump is a "bunch" or a "cluster." If you're a gardener, the last thing you want to see is a clump of weeds growing in the middle of your newly groomed lawn. Essentially, a clump is a grouping. You might see a clump of sheep grazing in a field or you might throw a clump of clothes into the washing machine. Clump can also mean lump, like when you find a clump of grass stuck to your shoe. As a verb, clump means "to gather," as in "a flock of birds clumped together in a tree."
Vocabulary lists containing clump
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.
Nearby, a group of men sat cross-legged on the ground in a circle, shielding their eyes from errant flakes as one of them hammered chunks off a large clump of gum.
From Los Angeles Times • May 31, 2026
"It is a pretty-looking thing," he concedes, plucking fragments off a clump torn from a carpet of green moss.
From BBC • May 30, 2026
Normal tau supports brain health, but the protein can clump into tangles that damage brain cells and cause memory loss.
From Barron's • May 14, 2026
Add more pasta water as needed — the sauce should lightly coat, not clump.
From Salon • Apr. 7, 2026
As the clump of boys came nearer, Fadi recognized Masood, Zayd, Ravi, and Carlos, from World History and Civilizations class.
From "Shooting Kabul" by N. H. Senzai
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.
