"stand-by" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "stand by"
      },
      "expansion": "Deverbal from stand by",
      "name": "deverbal"
    }
  ],
  "etymology_text": "Deverbal from stand by.",
  "forms": [
    {
      "form": "stand-bys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "s"
      },
      "expansion": "stand-by (plural stand-bys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "standby"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English deverbals",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1962 April, “Motive power miscellany: Eastern Region”, in Modern Railways, page 279",
          "text": "[...] a \"Britannia\" Pacific, No. 70006, was kept as a stand-by at March.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of standby"
      ],
      "id": "en-stand-by-en-noun-RPe3fuiJ",
      "links": [
        [
          "standby",
          "standby#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "stand-by"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "stand by"
      },
      "expansion": "Deverbal from stand by",
      "name": "deverbal"
    }
  ],
  "etymology_text": "Deverbal from stand by.",
  "forms": [
    {
      "form": "stand-bys",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "s"
      },
      "expansion": "stand-by (plural stand-bys)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "standby"
        }
      ],
      "categories": [
        "English countable nouns",
        "English deverbals",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1962 April, “Motive power miscellany: Eastern Region”, in Modern Railways, page 279",
          "text": "[...] a \"Britannia\" Pacific, No. 70006, was kept as a stand-by at March.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Alternative form of standby"
      ],
      "links": [
        [
          "standby",
          "standby#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "stand-by"
}