"bow drill" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "ref": "1999, Robert Lacey, Danny Danziger, The Year 1000: What life was like at the turn of The First Millennium, London: Abacus, published 2000, page 124:",
          "text": "[I]n the year 1000 the trepanner had at his disposal the semi-mechanical bow drill that was used by carpenters and masons of the time.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A simple rotational hand-operated tool of prehistoric origin, used as a fire drill for ignition, or for other drilling tasks such as woodwork and dentistry."
      ],
      "id": "en-bow_drill-en-noun-TfxtRcjy",
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          "simple",
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          "rotational",
          "rotational"
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          "tool"
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        [
          "prehistoric",
          "prehistoric"
        ],
        [
          "fire drill",
          "fire drill"
        ],
        [
          "ignition",
          "ignition"
        ],
        [
          "woodwork",
          "woodwork"
        ],
        [
          "dentistry",
          "dentistry"
        ]
      ]
    }
  ],
  "word": "bow drill"
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{
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    {
      "form": "bow drills",
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    }
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  "lang_code": "en",
  "pos": "noun",
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          "type": "quotation"
        }
      ],
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        "A simple rotational hand-operated tool of prehistoric origin, used as a fire drill for ignition, or for other drilling tasks such as woodwork and dentistry."
      ],
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          "ignition"
        ],
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          "woodwork",
          "woodwork"
        ],
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          "dentistry",
          "dentistry"
        ]
      ]
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  "word": "bow drill"
}