[clump] n [prob. fr. LG klump] (ca. 1586) 1: a group of things clustered together "a ~ of bushes"
2: a compact mass
3: a heavy tramping sound -- clumpy adj
[2]clump vi (1665) 1: to walk or move clumsily and noisily
2: to form clumps ~ vt: to arrange in or cause to form clumps "the serum ~s the bacteria"