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From Middle English twibill, from Old English twibill, from twī- (double) + bill (edge, blade). Note bill probably from German 'beil' or Dutch 'bijl' (axe) see also billhook


twibill (plural twibills)

  1. An axe with two cutting blades
  2. A mattock
  3. A double bladed tool used in gate type hurdle making for cutting out mortices, with a flat chisel and a mortice chisel or hook, similar to the much larger french carpenter's tool, the bisaigue (or besaigue)
  4. (obsolete) A double-bladed halberd or battle-axe