"back stairs" meaning in English

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      "expansion": "back stairs pl (plural only)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "alt_of": [
        {
          "word": "backstairs"
        }
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      "examples": [
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          "ref": "1885, W. S. Gilbert, The Mikado:",
          "text": "It is consequently my degrading duty to serve this upstart as First Lord of the Treasury, Lord Chief Justice, Commander-in-Chief, Lord High Admiral, Master of the Buckhounds, Groom of the Back Stairs, Archbishop of Titipu, and Lord Mayor, both acting and elect, all rolled into one.",
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      "glosses": [
        "Alternative spelling of backstairs"
      ],
      "id": "en-back_stairs-en-noun-vKVvdTfp",
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  "word": "back stairs"
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{
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      "args": {
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      "expansion": "back stairs pl (plural only)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "backstairs"
        }
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          "ref": "1885, W. S. Gilbert, The Mikado:",
          "text": "It is consequently my degrading duty to serve this upstart as First Lord of the Treasury, Lord Chief Justice, Commander-in-Chief, Lord High Admiral, Master of the Buckhounds, Groom of the Back Stairs, Archbishop of Titipu, and Lord Mayor, both acting and elect, all rolled into one.",
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        "Alternative spelling of backstairs"
      ],
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  "word": "back stairs"
}