clump

noun
  1. A compacted mass or lump of something, often consisting of a number of similar objects or material that are gathered or pressed together. noun
    He stepped on a clump of mud and got his shoes dirty.
    The gardener removed a clump of weeds from the flower bed.
  2. To form a heavy, solid mass or lump; to gather or cluster together in a thick mass. verb
    The children clumped together in the corner of the playground.
    The snow clumped on the branches after the storm.