"in reserve" meaning in English

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "in reserve",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "in reserve",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1960 December, Voyageur, “The Mountain Railways of the Bernese Oberland”, in Trains Illustrated, page 755",
          "text": "The Schynige Platte Railway carries on its traffic with no more than four electric locomotives (with one steam locomotive in reserve).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Stored and set aside for possible (future) use."
      ],
      "id": "en-in_reserve-en-prep_phrase-sbOxxlPL",
      "links": [
        [
          "Stored",
          "store"
        ],
        [
          "set aside",
          "set aside"
        ],
        [
          "future",
          "future"
        ]
      ],
      "related": [
        {
          "word": "in store"
        }
      ],
      "synonyms": [
        {
          "word": "reserve"
        },
        {
          "word": "spare"
        },
        {
          "word": "backup"
        }
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "set aside for future use",
          "word": "varalla"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "set aside for future use",
          "word": "de réserve"
        },
        {
          "code": "fr",
          "lang": "French",
          "sense": "set aside for future use",
          "word": "en réserve"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "set aside for future use",
          "word": "in Reserve"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "set aside for future use",
          "word": "auf Reserve"
        },
        {
          "code": "it",
          "lang": "Italian",
          "sense": "set aside for future use",
          "word": "di riserva"
        },
        {
          "code": "ro",
          "lang": "Romanian",
          "sense": "set aside for future use",
          "word": "în rezervă"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "sense": "set aside for future use",
          "word": "de reserva"
        }
      ]
    }
  ],
  "word": "in reserve"
}

{
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prepositional phrase",
        "head": ""
      },
      "expansion": "in reserve",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "in reserve",
      "name": "en-PP"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prep_phrase",
  "related": [
    {
      "word": "in store"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English prepositional phrases",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1960 December, Voyageur, “The Mountain Railways of the Bernese Oberland”, in Trains Illustrated, page 755",
          "text": "The Schynige Platte Railway carries on its traffic with no more than four electric locomotives (with one steam locomotive in reserve).",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Stored and set aside for possible (future) use."
      ],
      "links": [
        [
          "Stored",
          "store"
        ],
        [
          "set aside",
          "set aside"
        ],
        [
          "future",
          "future"
        ]
      ],
      "synonyms": [
        {
          "word": "reserve"
        },
        {
          "word": "spare"
        },
        {
          "word": "backup"
        }
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "set aside for future use",
      "word": "varalla"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "set aside for future use",
      "word": "de réserve"
    },
    {
      "code": "fr",
      "lang": "French",
      "sense": "set aside for future use",
      "word": "en réserve"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "set aside for future use",
      "word": "in Reserve"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "set aside for future use",
      "word": "auf Reserve"
    },
    {
      "code": "it",
      "lang": "Italian",
      "sense": "set aside for future use",
      "word": "di riserva"
    },
    {
      "code": "ro",
      "lang": "Romanian",
      "sense": "set aside for future use",
      "word": "în rezervă"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "sense": "set aside for future use",
      "word": "de reserva"
    }
  ],
  "word": "in reserve"
}