"spelled sideways" meaning in English

{
  "etymology_text": "As a play on the phrase \"spelled backwards\".",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "spelled sideways (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2001, Paul McFedries, The complete idiot's guide to Windows XP",
          "text": "It truly is a wired (which, remember, is just \"weird\" spelled sideways) world, and if you feel like you're the only person left who isn't online, this chapter will help.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Indicating an anagram or other approximate rearrangement of the letters in the original term."
      ],
      "id": "en-spelled_sideways-en-adv-00FbYZFi",
      "links": [
        [
          "anagram",
          "anagram#English"
        ]
      ],
      "raw_glosses": [
        "(colloquial) Indicating an anagram or other approximate rearrangement of the letters in the original term."
      ],
      "synonyms": [
        {
          "sense": "reordered as an anagram",
          "word": "anagrammed"
        },
        {
          "sense": "reordered as an anagram",
          "word": "anagrammatized"
        }
      ],
      "tags": [
        "colloquial",
        "not-comparable"
      ]
    }
  ],
  "word": "spelled sideways"
}

{
  "etymology_text": "As a play on the phrase \"spelled backwards\".",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "spelled sideways (not comparable)",
      "name": "en-adv"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "English adverbs",
        "English colloquialisms",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English terms with quotations",
        "English uncomparable adverbs",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2001, Paul McFedries, The complete idiot's guide to Windows XP",
          "text": "It truly is a wired (which, remember, is just \"weird\" spelled sideways) world, and if you feel like you're the only person left who isn't online, this chapter will help.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Indicating an anagram or other approximate rearrangement of the letters in the original term."
      ],
      "links": [
        [
          "anagram",
          "anagram#English"
        ]
      ],
      "raw_glosses": [
        "(colloquial) Indicating an anagram or other approximate rearrangement of the letters in the original term."
      ],
      "tags": [
        "colloquial",
        "not-comparable"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "reordered as an anagram",
      "word": "anagrammed"
    },
    {
      "sense": "reordered as an anagram",
      "word": "anagrammatized"
    }
  ],
  "word": "spelled sideways"
}