Source : Webster's Revised Unabridged Dictionary (1913)

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.

   2. A cluster; a group; a thicket.

            A clump of shrubby trees.             --Hawthorne.

   3. The compressed clay of coal strata. --Brande & C.

Clump \Clump\, v. t.
   To arrange in a clump or clumps; to cluster; to group.
   --Blackmore.

Clump \Clump\, v. i.
   To tread clumsily; to clamp. [Prov. Eng.] --Halliwell.

Source : WordNet®

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