"a las primeras de cambio" meaning in Spanish

{
  "etymology_templates": [
    {
      "args": {
        "1": "to the first ones of change"
      },
      "expansion": "“to the first ones of change”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "to the first ones of change"
      },
      "expansion": "Literally, “to the first ones of change”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “to the first ones of change”.",
  "head_templates": [
    {
      "args": {},
      "expansion": "a las primeras de cambio",
      "name": "es-adv"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1883, Benito Pérez Galdós, El doctor Centeno:",
          "text": "Como que ya sabía él algo, y aun algos de cosa tan buena, santa y admirable, de que se deriva la máquina toda del humano saber. Pero a las primeras de cambio, ¡Dios de los tontos!, empezó mi sabio a desbarrar.",
          "type": "quote"
        }
      ],
      "glosses": [
        "at the drop of a hat, at a moment's notice, in a heartbeat, all of a sudden"
      ],
      "id": "en-a_las_primeras_de_cambio-es-adv-MmQUz1HI",
      "links": [
        [
          "at the drop of a hat",
          "at the drop of a hat"
        ],
        [
          "at a moment's notice",
          "at a moment's notice"
        ],
        [
          "in a heartbeat",
          "in a heartbeat"
        ],
        [
          "all of a sudden",
          "all of a sudden"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) at the drop of a hat, at a moment's notice, in a heartbeat, all of a sudden"
      ],
      "synonyms": [
        {
          "word": "de buenas a primeras"
        },
        {
          "word": "al primer envite"
        },
        {
          "word": "de golpe"
        },
        {
          "word": "a la primera de cambio"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "word": "a las primeras de cambio"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "to the first ones of change"
      },
      "expansion": "“to the first ones of change”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "to the first ones of change"
      },
      "expansion": "Literally, “to the first ones of change”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “to the first ones of change”.",
  "head_templates": [
    {
      "args": {},
      "expansion": "a las primeras de cambio",
      "name": "es-adv"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "Pages with 1 entry",
        "Pages with entries",
        "Quotation templates to be cleaned",
        "Requests for translations of Spanish quotations",
        "Spanish adverbs",
        "Spanish entries with incorrect language header",
        "Spanish idioms",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish terms with quotations"
      ],
      "examples": [
        {
          "ref": "1883, Benito Pérez Galdós, El doctor Centeno:",
          "text": "Como que ya sabía él algo, y aun algos de cosa tan buena, santa y admirable, de que se deriva la máquina toda del humano saber. Pero a las primeras de cambio, ¡Dios de los tontos!, empezó mi sabio a desbarrar.",
          "type": "quote"
        }
      ],
      "glosses": [
        "at the drop of a hat, at a moment's notice, in a heartbeat, all of a sudden"
      ],
      "links": [
        [
          "at the drop of a hat",
          "at the drop of a hat"
        ],
        [
          "at a moment's notice",
          "at a moment's notice"
        ],
        [
          "in a heartbeat",
          "in a heartbeat"
        ],
        [
          "all of a sudden",
          "all of a sudden"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) at the drop of a hat, at a moment's notice, in a heartbeat, all of a sudden"
      ],
      "synonyms": [
        {
          "word": "de buenas a primeras"
        },
        {
          "word": "al primer envite"
        },
        {
          "word": "de golpe"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "a la primera de cambio"
    }
  ],
  "word": "a las primeras de cambio"
}