"knife edge" meaning in English

{
  "forms": [
    {
      "form": "knife edges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "knife edge (plural knife edges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "knife-edge"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2002, Sylvia Brownrigg, Pages for You",
          "text": "“Thank you, Flannery,” Anne said, her low voice a knife edge between sincerity and sarcasm, “for saving my life.\"",
          "type": "quotation"
        },
        {
          "ref": "2007, David A. Rollins, A Knife Edge",
          "text": "While I'd never been to Pakistan, I'd seen plenty of towns like this one just across the border in Afghanistan, perched on a knife edge between life and death, settlements where the people had nothing in their lives except for war, a few goats and a lot of religion.",
          "type": "quotation"
        },
        {
          "ref": "2016, Liz Nugent, Lying In Wait, page 82",
          "text": "I'm on a knife edge, Lydia, don't you see?",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of knife-edge"
      ],
      "id": "en-knife_edge-en-noun-h8gU9OmM",
      "links": [
        [
          "knife-edge",
          "knife-edge#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "knife edge"
}

{
  "forms": [
    {
      "form": "knife edges",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "knife edge (plural knife edges)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "knife-edge"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2002, Sylvia Brownrigg, Pages for You",
          "text": "“Thank you, Flannery,” Anne said, her low voice a knife edge between sincerity and sarcasm, “for saving my life.\"",
          "type": "quotation"
        },
        {
          "ref": "2007, David A. Rollins, A Knife Edge",
          "text": "While I'd never been to Pakistan, I'd seen plenty of towns like this one just across the border in Afghanistan, perched on a knife edge between life and death, settlements where the people had nothing in their lives except for war, a few goats and a lot of religion.",
          "type": "quotation"
        },
        {
          "ref": "2016, Liz Nugent, Lying In Wait, page 82",
          "text": "I'm on a knife edge, Lydia, don't you see?",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of knife-edge"
      ],
      "links": [
        [
          "knife-edge",
          "knife-edge#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "knife edge"
}