"shift lock" meaning in English

{
  "forms": [
    {
      "form": "shift locks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shift lock (plural shift locks)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "2006, Tsitsi Dangarembga, The Book of Not, Faber & Faber Limited (2021), page 264",
          "text": "Belinda released the shift lock and reverted to lower case.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A lock key on a typewriter, which, when pressed, causes all subsequently typed letters to be capitalized."
      ],
      "id": "en-shift_lock-en-noun-ue9qXcKZ",
      "links": [
        [
          "lock key",
          "lock key"
        ],
        [
          "typewriter",
          "typewriter"
        ],
        [
          "press",
          "press"
        ],
        [
          "subsequently",
          "subsequently"
        ],
        [
          "capitalized",
          "capitalized"
        ]
      ],
      "qualifier": "typewriting",
      "raw_glosses": [
        "(typewriting) A lock key on a typewriter, which, when pressed, causes all subsequently typed letters to be capitalized."
      ]
    }
  ],
  "word": "shift lock"
}

{
  "forms": [
    {
      "form": "shift locks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "shift lock (plural shift locks)",
      "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 terms with quotations"
      ],
      "examples": [
        {
          "ref": "2006, Tsitsi Dangarembga, The Book of Not, Faber & Faber Limited (2021), page 264",
          "text": "Belinda released the shift lock and reverted to lower case.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A lock key on a typewriter, which, when pressed, causes all subsequently typed letters to be capitalized."
      ],
      "links": [
        [
          "lock key",
          "lock key"
        ],
        [
          "typewriter",
          "typewriter"
        ],
        [
          "press",
          "press"
        ],
        [
          "subsequently",
          "subsequently"
        ],
        [
          "capitalized",
          "capitalized"
        ]
      ],
      "qualifier": "typewriting",
      "raw_glosses": [
        "(typewriting) A lock key on a typewriter, which, when pressed, causes all subsequently typed letters to be capitalized."
      ]
    }
  ],
  "word": "shift lock"
}