"knock wood" meaning in English

{
  "forms": [
    {
      "form": "knocks wood",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "knocking wood",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "knocked wood",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "knocked wood",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "knock wood (third-person singular simple present knocks wood, present participle knocking wood, simple past and past participle knocked wood)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "word": "knock on wood"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2013, Lesley Ann McDaniel, Big Sky Bachelor, page 55:",
          "text": "It's in an ultranice neighborhood. Pretty close to your school and to the boutique where — knock wood — I think I'm going to be working.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of knock on wood"
      ],
      "id": "en-knock_wood-en-verb-xzBadZCN",
      "links": [
        [
          "knock on wood",
          "knock on wood#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "knock wood"
}

{
  "forms": [
    {
      "form": "knocks wood",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "knocking wood",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "knocked wood",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "knocked wood",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "knock wood (third-person singular simple present knocks wood, present participle knocking wood, simple past and past participle knocked wood)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "alt_of": [
        {
          "word": "knock on wood"
        }
      ],
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English verbs",
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2013, Lesley Ann McDaniel, Big Sky Bachelor, page 55:",
          "text": "It's in an ultranice neighborhood. Pretty close to your school and to the boutique where — knock wood — I think I'm going to be working.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative form of knock on wood"
      ],
      "links": [
        [
          "knock on wood",
          "knock on wood#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "knock wood"
}