"old woman's tooth" meaning in English

{
  "etymology_text": "From its shape, which has a broad base and a narrow blade projecting well beyond its base plate.",
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "old woman's tooth",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Woodworking",
          "orig": "en:Woodworking",
          "parents": [
            "Crafts",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A traditional hand-operated router."
      ],
      "id": "en-old_woman's_tooth-en-noun-vKGNScsL",
      "links": [
        [
          "woodworking",
          "woodworking"
        ],
        [
          "hand",
          "hand"
        ],
        [
          "router",
          "router"
        ]
      ],
      "raw_glosses": [
        "(woodworking) A traditional hand-operated router."
      ],
      "topics": [
        "arts",
        "business",
        "carpentry",
        "construction",
        "crafts",
        "hobbies",
        "lifestyle",
        "manufacturing",
        "woodworking"
      ]
    }
  ],
  "word": "old woman's tooth"
}

{
  "etymology_text": "From its shape, which has a broad base and a narrow blade projecting well beyond its base plate.",
  "head_templates": [
    {
      "args": {
        "1": "?"
      },
      "expansion": "old woman's tooth",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "en:Woodworking"
      ],
      "glosses": [
        "A traditional hand-operated router."
      ],
      "links": [
        [
          "woodworking",
          "woodworking"
        ],
        [
          "hand",
          "hand"
        ],
        [
          "router",
          "router"
        ]
      ],
      "raw_glosses": [
        "(woodworking) A traditional hand-operated router."
      ],
      "topics": [
        "arts",
        "business",
        "carpentry",
        "construction",
        "crafts",
        "hobbies",
        "lifestyle",
        "manufacturing",
        "woodworking"
      ]
    }
  ],
  "word": "old woman's tooth"
}