"-stock" meaning in English

{
  "etymology_text": "From Woodstock, a famous American festival.",
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      "expansion": "-stock",
      "name": "head"
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    {
      "args": {},
      "expansion": "-stock",
      "name": "en-suffix"
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  "lang": "English",
  "lang_code": "en",
  "pos": "suffix",
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      "categories": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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          "source": "w"
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          "ref": "2002, San Francisco Chronicle -, Pope musters energy to rally church's next generation:",
          "text": "From a 25-foot-high platform on the shores of Lake Ontario reminiscent of a rock concert stage, John Paul delivered his prescription for a fulfilling life to the Catholic Church's next generation during the three-hour opening ceremony of World Youth Day, also dubbed \"Popestock.\"",
          "type": "quote"
        },
        {
          "ref": "2004, Las Vegas Mercury -, A/E: Entertainment calendar (cont.):",
          "text": "Cheesestock: Camping event for people who love cheese. Must bring a cheese dish or item. March 6",
          "type": "quote"
        },
        {
          "text": "2004, The Daily Collegian (Penn State) - Filmstock festival an indie darling"
        }
      ],
      "glosses": [
        "Forming the names of theme-based festivals or concerts."
      ],
      "id": "en--stock-en-suffix-h~NqEsI5",
      "links": [
        [
          "festival",
          "festival"
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        [
          "concert",
          "concert"
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      ],
      "tags": [
        "morpheme"
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    }
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  "word": "-stock"
}

{
  "etymology_text": "From Woodstock, a famous American festival.",
  "head_templates": [
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      "args": {
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        "cat2": "",
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      "expansion": "-stock",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "-stock",
      "name": "en-suffix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "suffix",
  "senses": [
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        "Quotation templates to be cleaned"
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      "examples": [
        {
          "ref": "2002, San Francisco Chronicle -, Pope musters energy to rally church's next generation:",
          "text": "From a 25-foot-high platform on the shores of Lake Ontario reminiscent of a rock concert stage, John Paul delivered his prescription for a fulfilling life to the Catholic Church's next generation during the three-hour opening ceremony of World Youth Day, also dubbed \"Popestock.\"",
          "type": "quote"
        },
        {
          "ref": "2004, Las Vegas Mercury -, A/E: Entertainment calendar (cont.):",
          "text": "Cheesestock: Camping event for people who love cheese. Must bring a cheese dish or item. March 6",
          "type": "quote"
        },
        {
          "text": "2004, The Daily Collegian (Penn State) - Filmstock festival an indie darling"
        }
      ],
      "glosses": [
        "Forming the names of theme-based festivals or concerts."
      ],
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        [
          "festival",
          "festival"
        ],
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          "concert",
          "concert"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-stock"
}