The Collaborative International Dictionary of English v.0.48:

Clump \Clump\ (kl[u^]mp), n. [Cf. D. klomp lump, G. klump,
   klumpen, Dan. klump, Sw. klump; perh. akin to L. globus, E.
   globe. Cf. Club.]
   1. An unshaped piece or mass of wood or other substance.
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   2. A cluster; a group; a thicket.
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            A clump of shrubby trees.             --Hawthorne.
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   3. The compressed clay of coal strata. --Brande & C.
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The Collaborative International Dictionary of English v.0.48:

Clump \Clump\, v. t.
   To arrange in a clump or clumps; to cluster; to group.
   --Blackmore.
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The Collaborative International Dictionary of English v.0.48:

Clump \Clump\, v. i.
   To tread clumsily; to clamp. [Prov. Eng.] --Halliwell.
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WordNet (r) 3.0 (2006):

clump
    n 1: a grouping of a number of similar things; "a bunch of
         trees"; "a cluster of admirers" [syn: bunch, clump,
         cluster, clustering]
    2: a compact mass; "a ball of mud caught him on the shoulder"
       [syn: ball, clod, glob, lump, clump, chunk]
    3: a heavy dull sound (as made by impact of heavy objects) [syn:
       thump, thumping, clump, clunk, thud]
    v 1: make or move along with a sound as of a horse's hooves
         striking the ground [syn: clop, clump, clunk,
         plunk]
    2: come together as in a cluster or flock; "The poets
       constellate in this town every summer" [syn: cluster,
       constellate, flock, clump]
    3: walk clumsily [syn: clump, clomp]
    4: gather or cause to gather into a cluster; "She bunched her
       fingers into a fist" [syn: bunch, bunch up, bundle,
       cluster, clump]