clump

American  

[kluhmp] / klʌmp /

noun

1. a small, close group or cluster, especially of trees or other plants.

2. a lump or mass

3. a heavy, thumping step, sound, etc.

4. Immunology. a cluster of agglutinated bacteria, red blood cells, etc.

5. a thick extra sole on a shoe.

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verb (used without object)

1. Also clomp to walk heavily and clumsily.

2. Immunology. to gather or be gathered into clumps; agglutinate.

verb (used with object)

1. to gather or form into a clump; mass.

clump British  

/ klʌmp /

noun

1. a cluster, as of trees or plants

2. a dull heavy tread or any similar sound

3. an irregular mass

   a clump of hair or earth

4. an inactive mass of microorganisms, esp a mass of bacteria produced as a result of agglutination

5. an extra sole on a shoe

6. slang a blow

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verb

1. (intr) to walk or tread heavily

2. to gather or be gathered into clumps, clusters, clots, etc

3. to cause (bacteria, blood cells, etc) to collect together or (of bacteria, etc) to collect together

4. slang (tr) to punch (someone)

Other Word Forms

• clumpiness
  noun
• clumpish
  adjective
• clumplike
  adjective
• clumpy
  adjective

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."

Example Sentences

Make sure to stir the rice and milk so that the rice doesn’t clump up.

From Salon • Jan. 10, 2026

It was shown that spermine causes the harmful proteins to gather and, in a sense, clump together through biomolecular condensation.

From Science Daily • Nov. 27, 2025

Its true identity is still uncertain: it could be a dense clump of dark matter, roughly 100 times smaller than any previously detected, or possibly an extremely compact, inactive dwarf galaxy.

From Science Daily • Oct. 11, 2025

Digging a healthy clump of potatoes from the rich, black soil, Craig says, "potatoes are an amazing crop. You can't knock that, but we know things need to change."

From BBC • Sep. 27, 2025

It was a tiny clump of green glitter.

From "Sleepover Sleuths: Nancy Drew and the Clue Crew, #1" by Carolyn Keene

Related Words

• blob
• bundle
• chunk
• cluster
• hunk
• jumble
• knot
• lump
• wad