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Verb: chip in
Usage: informal
  1. Provide a part of a whole amount; give towards some cause
    "I chipped in at the office";
    - contribute, give, kick in
  2. Break into a conversation
    - chime in [informal], cut in, put in, butt in, barge in [informal], break in

Derived forms: chipped in, chips in, chipping in

Type of: break up, cut off, disrupt, give, interrupt