Webster's English Dictionary

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clump

1. clump \'kl*mp\ \'kl*m-pe-\ n [prob. fr. LG klump; akin to OE clamm] 1: a 
   group of things clustered together  2: a compact mass  3: a heavy tramping 
   sound  - clumpy aj
2. clump vi 1: to tread clumsily and noisily  2: to form clumps  : to 
   arrange in or cause to form clumps