"off one's nut" meaning in English

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      "expansion": "off one's nut",
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  "lang_code": "en",
  "pos": "prep_phrase",
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      "examples": [
        {
          "ref": "1909, P. G. Wodehouse, chapter 17, in Mike: A Public School Story:",
          "text": "Old Smith was awfully bucked because he'd taken four wickets. I should think he'd go off his nut if he took eight ever.",
          "type": "quote"
        },
        {
          "ref": "1914, Zane Grey, chapter 13, in The Rustlers of Pecos County:",
          "text": "\"[I]f I was to spring this news in Mr. Wright's hearin', why, such a sensitive, high-tempered gentleman as he would go plumb off his nut.\"",
          "type": "quote"
        },
        {
          "ref": "1918, Rex Ellingwood Beach, chapter 11, in The Winds of Chance:",
          "text": "\"Look at them rapids ahead of us! Why, the guy that laid out this river was off his nut!\"",
          "type": "quote"
        }
      ],
      "glosses": [
        "Insane, crazy."
      ],
      "id": "en-off_one's_nut-en-prep_phrase-3b48~cT5",
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        [
          "Insane",
          "insane"
        ],
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          "crazy",
          "crazy"
        ]
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      "raw_glosses": [
        "(chiefly British, dated in US, idiomatic) Insane, crazy."
      ],
      "raw_tags": [
        "in US"
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      "synonyms": [
        {
          "tags": [
            "US"
          ],
          "word": "off one's rocker"
        }
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        "dated",
        "idiomatic"
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  "word": "off one's nut"
}

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          "ref": "1909, P. G. Wodehouse, chapter 17, in Mike: A Public School Story:",
          "text": "Old Smith was awfully bucked because he'd taken four wickets. I should think he'd go off his nut if he took eight ever.",
          "type": "quote"
        },
        {
          "ref": "1914, Zane Grey, chapter 13, in The Rustlers of Pecos County:",
          "text": "\"[I]f I was to spring this news in Mr. Wright's hearin', why, such a sensitive, high-tempered gentleman as he would go plumb off his nut.\"",
          "type": "quote"
        },
        {
          "ref": "1918, Rex Ellingwood Beach, chapter 11, in The Winds of Chance:",
          "text": "\"Look at them rapids ahead of us! Why, the guy that laid out this river was off his nut!\"",
          "type": "quote"
        }
      ],
      "glosses": [
        "Insane, crazy."
      ],
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        "(chiefly British, dated in US, idiomatic) Insane, crazy."
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        "idiomatic"
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  "synonyms": [
    {
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        "US"
      ],
      "word": "off one's rocker"
    }
  ],
  "word": "off one's nut"
}