n. & v.
n. 1 (foll. by of) a cluster of plants, esp. trees or shrubs. 2 an agglutinated mass of blood-cells etc. 3 a thick extra sole on a boot or shoe.
v. 1 a intr. form a clump. b tr. heap or plant together. 2 intr. (also clomp) walk with heavy tread. 3 tr. colloq. hit. clumpy adj. (clumpier, clumpiest).
[ MLG klumpe, MDu. klompe: see CLUB ]