What does clump mean?
A clump is a small, dense cluster of things gathered or growing tightly together — a clump of trees at the field's edge, a clump of wet soil on a boot, a clump of hair in a brush. The word carries a sense of compactness and slight disorder: whatever is in a clump has collected into a mass rather than being neatly arranged. As a verb, clump works in two directions. It can describe things coming together into a mass — blood cells clumping in a laboratory sample, or people clumping together at a party — and it can also describe heavy, noisy movement, as when someone clumps around upstairs in hard-soled shoes. This second sense is informal but widely understood and adds a satisfying physicality to description. Derived from words related to lumps and masses, clump is a concrete, versatile term equally at home in botany, medicine, and everyday speech.
A compact group or cluster of things growing or gathered closely together, such as trees, plants, hair, or earth.
"The path disappeared behind a dense clump of bamboo."
Most commonly applied to vegetation, but also to soil, hair, and other matter that gathers into masses.
To gather or cause to gather into a dense cluster or mass; also, to walk heavily so as to make loud thudding sounds.
"The cream had begun to clump in the coffee."
In scientific contexts, 'clump' often refers to cells or particles aggregating, as in blood agglutination.
Standard regular plural; common in descriptions of vegetation and landscape, e.g., scattered clumps across a hillside.
"Clumps of wild garlic lined the shaded bank."
The same word that describes a quiet clump of moss also describes the sound of heavy boots stomping down a hallway — English rarely lets one word do such different jobs so well.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of clump
Clump first appears in English in the late sixteenth to early seventeenth century, originally meaning a lump or compact mass. It is probably related to or a variant of older Germanic words for lumps and rounded masses, sitting alongside relatives such as Dutch klomp (a wooden shoe or lump) and German Klumpen (a lump), all tracing back to a Germanic root denoting a rounded mass. Over time its meaning narrowed toward clusters of growing vegetation while also developing the verbal senses of gathering into a mass and treading heavily.
How clump is actually used
The noun sense is neutral in register. The verb sense of walking heavily is somewhat informal and vivid, often used for comic or evocative effect. The grouping verb frequently appears in scientific writing about cells or particles 'clumping together', especially in biology (e.g., blood cells clumping in agglutination tests).
Easily confused with clump
A cluster is any group of similar things gathered closely together, while a clump specifically suggests a dense, often shapeless mass or a compact group rooted in one spot.