"'tween deck" meaning in English

{
  "forms": [
    {
      "form": "'tween decks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "'tween decks"
      },
      "expansion": "'tween deck (plural 'tween decks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "tweendeck"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 194:",
          "text": "I stole quietly to the combings of the hatchway, which was open, and we looked down into the 'tween decks.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative spelling of tweendeck"
      ],
      "id": "en-'tween_deck-en-noun-ydEAdJgW",
      "links": [
        [
          "tweendeck",
          "tweendeck#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "'tween deck"
}

{
  "forms": [
    {
      "form": "'tween decks",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "'tween decks"
      },
      "expansion": "'tween deck (plural 'tween decks)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "tweendeck"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1887, Harriet W. Daly, Digging, Squatting, and Pioneering Life in the Northern Territory of South Australia, page 194:",
          "text": "I stole quietly to the combings of the hatchway, which was open, and we looked down into the 'tween decks.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Alternative spelling of tweendeck"
      ],
      "links": [
        [
          "tweendeck",
          "tweendeck#English"
        ]
      ],
      "tags": [
        "alt-of",
        "alternative"
      ]
    }
  ],
  "word": "'tween deck"
}