(1):

(n.) A cluster; a group; a thicket.

(2):

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

(3):

(n.) An unshaped piece or mass of wood or other substance.

(4):

(v. i.) To tread clumsily; to clamp.

(5):

(n.) The compressed clay of coal strata.