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Verb: bunch up
  1. Form into a bunch
    "The frightened children bunched up in the corner of the classroom";
    - bunch together, bunch
  2. Gather or cause to gather into a cluster
    "She bunched up her fingers into a fist";
    - bunch, bundle, cluster, clump

Derived forms: bunching up, bunched up, bunches up

Type of: clump, cluster, constellate, flock, form