[1] : WordNet (r) 2.0

bunch up
     v 1: form into a bunch; "the frightened children bunched together
          in the corner of the classroom" syn: bunch together,
          bunch
     2: gather or cause to gather into a cluster; "she bunched her
        fingers into a fist"; "the students bunched up at the
        registration desk" syn: bunch, bundle, cluster, clump
see also:
bunch together bunch bundle cluster clump 

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