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Wiktionary
bunch up

vb. To come or gather together.

WordNet
bunch up
  1. v. 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]

Usage examples of "bunch up".

He couldn't shoot well because his hands, when he stretched, reached only to the wrists of the suit, which was too bulky to bunch up further.