"contango day" meaning in English

{
  "etymology_text": "contango + day",
  "forms": [
    {
      "form": "contango days",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "contango day (plural contango days)",
      "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"
        },
        {
          "kind": "other",
          "name": "Undetermined quotations with omitted translation",
          "parents": [
            "Quotations with omitted translation",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "1968, P. G. Wodehouse, 'Do Butlers Burgle Banks?', Everyman, London: 2005, p 156.\n'Let's see, when is next contango day?' asked Ferdie."
        }
      ],
      "glosses": [
        "The second day before payment of a contango debt is due."
      ],
      "id": "en-contango_day-en-noun-1IKDCv5Y",
      "links": [
        [
          "William Blackwood and Sons",
          "William Blackwood and Sons"
        ]
      ],
      "qualifier": "London Stock Exchange",
      "raw_glosses": [
        "(obsolete, London Stock Exchange) The second day before payment of a contango debt is due."
      ],
      "tags": [
        "obsolete"
      ]
    }
  ],
  "word": "contango day"
}

{
  "etymology_text": "contango + day",
  "forms": [
    {
      "form": "contango days",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "contango day (plural contango days)",
      "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 obsolete senses",
        "Undetermined quotations with omitted translation",
        "Undetermined terms with quotations"
      ],
      "examples": [
        {
          "text": "1968, P. G. Wodehouse, 'Do Butlers Burgle Banks?', Everyman, London: 2005, p 156.\n'Let's see, when is next contango day?' asked Ferdie."
        }
      ],
      "glosses": [
        "The second day before payment of a contango debt is due."
      ],
      "links": [
        [
          "William Blackwood and Sons",
          "William Blackwood and Sons"
        ]
      ],
      "qualifier": "London Stock Exchange",
      "raw_glosses": [
        "(obsolete, London Stock Exchange) The second day before payment of a contango debt is due."
      ],
      "tags": [
        "obsolete"
      ]
    }
  ],
  "word": "contango day"
}