"falling knife" meaning in English

{
  "forms": [
    {
      "form": "falling knives",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "falling knives"
      },
      "expansion": "falling knife (plural falling knives)",
      "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": "Trading",
          "orig": "en:Trading",
          "parents": [
            "Business",
            "Economics",
            "Society",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "catch a falling knife"
        }
      ],
      "glosses": [
        "A stock whose price has dropped rapidly."
      ],
      "id": "en-falling_knife-en-noun--9TodmuC",
      "links": [
        [
          "trading",
          "trading#Noun"
        ],
        [
          "stock",
          "stock"
        ]
      ],
      "raw_glosses": [
        "(trading) A stock whose price has dropped rapidly."
      ],
      "topics": [
        "business",
        "finance",
        "trading"
      ]
    }
  ],
  "word": "falling knife"
}

{
  "derived": [
    {
      "word": "catch a falling knife"
    }
  ],
  "forms": [
    {
      "form": "falling knives",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "falling knives"
      },
      "expansion": "falling knife (plural falling knives)",
      "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",
        "en:Trading"
      ],
      "glosses": [
        "A stock whose price has dropped rapidly."
      ],
      "links": [
        [
          "trading",
          "trading#Noun"
        ],
        [
          "stock",
          "stock"
        ]
      ],
      "raw_glosses": [
        "(trading) A stock whose price has dropped rapidly."
      ],
      "topics": [
        "business",
        "finance",
        "trading"
      ]
    }
  ],
  "word": "falling knife"
}