Clump /(klŭmp)/

Clump

n.
  1. An unshaped piece or mass of wood or other substance.
  2. A cluster; a group; a thicket.
    A clump of shrubby trees.
  3. The compressed clay of coal strata.

Clump

v. t.
  1. To arrange in a clump or clumps; to cluster; to group.

Clump

v. i.
  1. To tread clumsily; to clamp. [Prov. Eng.]