"backwards time machine" meaning in English

{
  "antonyms": [
    {
      "word": "forward time machine"
    }
  ],
  "forms": [
    {
      "form": "backwards time machines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "backwards time machine"
      },
      "expansion": "backwards time machine (plural backwards time machines)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Science fiction",
          "orig": "en:Science fiction",
          "parents": [
            "Fiction",
            "Speculative fiction",
            "Artistic works",
            "Genres",
            "Art",
            "Entertainment",
            "Culture",
            "Society",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Time travel",
          "orig": "en:Time travel",
          "parents": [
            "Relativity",
            "Science fiction",
            "Time",
            "Travel",
            "Physics",
            "Fiction",
            "Speculative fiction",
            "All topics",
            "Human activity",
            "Transport",
            "Sciences",
            "Artistic works",
            "Genres",
            "Fundamental",
            "Human behaviour",
            "Art",
            "Entertainment",
            "Human",
            "Culture",
            "Society"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A time machine that can only allow travel to the past, but cannot also allow travel to the future."
      ],
      "id": "en-backwards_time_machine-en-noun-zVSA6-MR",
      "links": [
        [
          "science fiction",
          "science fiction"
        ],
        [
          "time machine",
          "time machine#English"
        ],
        [
          "past",
          "past#English"
        ],
        [
          "future",
          "future#English"
        ]
      ],
      "raw_glosses": [
        "(science fiction) A time machine that can only allow travel to the past, but cannot also allow travel to the future."
      ],
      "synonyms": [
        {
          "tags": [
            "rare"
          ],
          "word": "backward time machine"
        }
      ],
      "topics": [
        "literature",
        "media",
        "publishing",
        "science-fiction"
      ]
    }
  ],
  "word": "backwards time machine"
}

{
  "antonyms": [
    {
      "word": "forward time machine"
    }
  ],
  "forms": [
    {
      "form": "backwards time machines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "head": "backwards time machine"
      },
      "expansion": "backwards time machine (plural backwards time machines)",
      "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Science fiction",
        "en:Time travel"
      ],
      "glosses": [
        "A time machine that can only allow travel to the past, but cannot also allow travel to the future."
      ],
      "links": [
        [
          "science fiction",
          "science fiction"
        ],
        [
          "time machine",
          "time machine#English"
        ],
        [
          "past",
          "past#English"
        ],
        [
          "future",
          "future#English"
        ]
      ],
      "raw_glosses": [
        "(science fiction) A time machine that can only allow travel to the past, but cannot also allow travel to the future."
      ],
      "topics": [
        "literature",
        "media",
        "publishing",
        "science-fiction"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "rare"
      ],
      "word": "backward time machine"
    }
  ],
  "word": "backwards time machine"
}