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open-mouthed (comparative more open-mouthed, superlative most open-mouthed)

  1. (obsolete) Talkative, speaking freely.
    • 1485, Thomas Malory, Le Morte Darthur, Book XVIII:
      many in the courte spake of hit – and in especiall Sir Aggravayne, Sir Gawaynes brothir, for he was ever opynne-mowthed.
  2. With the mouth open.
  3. Gaping in surprise, wonder or astonishment.