v make or move along with a sound as of a horse's hooves striking the groundv come together as in a cluster or flockv walk clumsilyv gather or cause to gather into a cluster
a. [医]成群的v. （树、灌木、植物等的）丛、簇( clump的过去式和过去分词 ); （土、泥等）团; 块; 笨重的脚步声