"バックミラー" meaning in 日语

{
  "categories": [
    {
      "kind": "other",
      "name": "帶「ー」的日語詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日語名詞",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日語片假名",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "日語詞元",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "有1個詞條的頁面",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "派生自英語的日語詞",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_text": "和製英語 (wasei eigo)，源自英語 back + mirror:Template:分類，英语中应作rear-view mirror。",
  "forms": [
    {
      "form": "bakku mirā",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "日语",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "后视镜"
      ],
      "id": "zh-バックミラー-ja-noun-rSuhSoLU"
    }
  ],
  "word": "バックミラー"
}

{
  "categories": [
    "帶「ー」的日語詞",
    "日語名詞",
    "日語片假名",
    "日語詞元",
    "有1個詞條的頁面",
    "派生自英語的日語詞"
  ],
  "etymology_text": "和製英語 (wasei eigo)，源自英語 back + mirror:Template:分類，英语中应作rear-view mirror。",
  "forms": [
    {
      "form": "bakku mirā",
      "tags": [
        "romanization"
      ]
    }
  ],
  "lang": "日语",
  "lang_code": "ja",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "后视镜"
      ]
    }
  ],
  "word": "バックミラー"
}