"mad as a March hare" meaning in English

{
  "etymology_text": "Possibly from the boisterous behaviour of hares in their breeding season.",
  "head_templates": [
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      "args": {
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      },
      "expansion": "mad as a March hare (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
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          "source": "w"
        },
        {
          "kind": "other",
          "name": "English similes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Lewis Carroll",
          "orig": "en:Lewis Carroll",
          "parents": [
            "Authors",
            "British fiction",
            "Fantasy",
            "Individuals",
            "Literature",
            "People",
            "Fiction",
            "Speculative fiction",
            "Culture",
            "Entertainment",
            "Writing",
            "Human",
            "Artistic works",
            "Genres",
            "Society",
            "Human behaviour",
            "Language",
            "All topics",
            "Art",
            "Communication",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1577, Richard Stanyhurst [i.e., Richard Stanihurst], “[The Historie of Irelande […].] A Treatise Contayning a Playne and Perfect Description of Irelande, […].”, in Raphaell Holinshed, The Firste Volume of the Chronicles of England, Scotlande, and Irelande […], volume I, London: […] [Henry Bynneman] for Iohn Hunne, →OCLC, folio 14, recto, column 1:",
          "text": "[S]he was with childe in hir huſbande his abſence, or that hir louer vſed hir fondly in open preſence, as the preſumption was not onely vehement, but alſo the fact too too apparent. Hir vnfortunat huſband had not ſooner notice gyuen him vpon his returne of theſe ſorowfull newes, then his fingers began to nibble, hys teeth to grinne, hys eyes to trickle, his eares to dindle, his heade to dezell, in ſomuch as his heart being ſkeared wyth ialouſie, & his wits enſtalde through Phrenſie, he became as madde, as a marche hare.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Crazy, demented."
      ],
      "id": "en-mad_as_a_March_hare-en-adj-FIxYkXXc",
      "links": [
        [
          "Crazy",
          "crazy"
        ],
        [
          "demented",
          "demented#Adjective"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, informal) Crazy, demented."
      ],
      "synonyms": [
        {
          "word": "mad as a hatter"
        },
        {
          "word": "insane"
        }
      ],
      "tags": [
        "informal",
        "not-comparable"
      ],
      "wikipedia": [
        "mad as a March hare"
      ]
    }
  ],
  "sounds": [
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      "audio": "En-au-mad as a March hare.ogg",
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  "word": "mad as a March hare"
}

{
  "etymology_text": "Possibly from the boisterous behaviour of hares in their breeding season.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "mad as a March hare (not comparable)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        "English adjectives",
        "English entries with incorrect language header",
        "English informal terms",
        "English lemmas",
        "English multiword terms",
        "English similes",
        "English terms with quotations",
        "English uncomparable adjectives",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Lewis Carroll"
      ],
      "examples": [
        {
          "ref": "1577, Richard Stanyhurst [i.e., Richard Stanihurst], “[The Historie of Irelande […].] A Treatise Contayning a Playne and Perfect Description of Irelande, […].”, in Raphaell Holinshed, The Firste Volume of the Chronicles of England, Scotlande, and Irelande […], volume I, London: […] [Henry Bynneman] for Iohn Hunne, →OCLC, folio 14, recto, column 1:",
          "text": "[S]he was with childe in hir huſbande his abſence, or that hir louer vſed hir fondly in open preſence, as the preſumption was not onely vehement, but alſo the fact too too apparent. Hir vnfortunat huſband had not ſooner notice gyuen him vpon his returne of theſe ſorowfull newes, then his fingers began to nibble, hys teeth to grinne, hys eyes to trickle, his eares to dindle, his heade to dezell, in ſomuch as his heart being ſkeared wyth ialouſie, & his wits enſtalde through Phrenſie, he became as madde, as a marche hare.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Crazy, demented."
      ],
      "links": [
        [
          "Crazy",
          "crazy"
        ],
        [
          "demented",
          "demented#Adjective"
        ]
      ],
      "qualifier": "simile",
      "raw_glosses": [
        "(simile, informal) Crazy, demented."
      ],
      "synonyms": [
        {
          "word": "mad as a hatter"
        },
        {
          "word": "insane"
        }
      ],
      "tags": [
        "informal",
        "not-comparable"
      ],
      "wikipedia": [
        "mad as a March hare"
      ]
    }
  ],
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      "audio": "En-au-mad as a March hare.ogg",
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  "word": "mad as a March hare"
}