"grundies" meaning in English

{
  "etymology_text": "* As Grundies, an underwear brand name.\n* Possibly an abbreviated form of Reg Grundies, rhyming slang for undies, after media magnate Reg Grundy.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "grundies pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Australian English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "British English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "New Zealand English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 2 entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2003, Ken Catran, Bloody Liggie, page 95:",
          "text": "So I shrugged and shifted like my grundies were too tight.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Underpants."
      ],
      "id": "en-grundies-en-noun-6afha4D~",
      "links": [
        [
          "Underpants",
          "underpants"
        ]
      ],
      "raw_glosses": [
        "(Australia, New Zealand, UK, slang) Underpants."
      ],
      "tags": [
        "Australia",
        "New-Zealand",
        "UK",
        "plural",
        "plural-only",
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "EN-AU ck1 grundies.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/88/EN-AU_ck1_grundies.ogg/EN-AU_ck1_grundies.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/8/88/EN-AU_ck1_grundies.ogg"
    }
  ],
  "word": "grundies"
}

{
  "etymology_text": "* As Grundies, an underwear brand name.\n* Possibly an abbreviated form of Reg Grundies, rhyming slang for undies, after media magnate Reg Grundy.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "grundies pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Australian English",
        "British English",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English pluralia tantum",
        "English slang",
        "English terms with quotations",
        "New Zealand English",
        "Pages with 2 entries",
        "Pages with entries",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2003, Ken Catran, Bloody Liggie, page 95:",
          "text": "So I shrugged and shifted like my grundies were too tight.",
          "type": "quote"
        }
      ],
      "glosses": [
        "Underpants."
      ],
      "links": [
        [
          "Underpants",
          "underpants"
        ]
      ],
      "raw_glosses": [
        "(Australia, New Zealand, UK, slang) Underpants."
      ],
      "tags": [
        "Australia",
        "New-Zealand",
        "UK",
        "plural",
        "plural-only",
        "slang"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "EN-AU ck1 grundies.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/88/EN-AU_ck1_grundies.ogg/EN-AU_ck1_grundies.ogg.mp3",
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  ],
  "word": "grundies"
}