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Verb: yack away
Usage: informal
  1. Talk incessantly and tiresomely
    "The teenagers yacked away on their phones for hours";
    - yack [informal], jaw [informal], rattle on [informal], yap away [informal], yak [informal]

Derived forms: yacking away, yacked away, yacks away

Type of: mouth, speak, talk, utter, verbalise [Brit], verbalize