"union shop" meaning in English

{
  "forms": [
    {
      "form": "union shops",
      "tags": [
        "plural"
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    }
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  "head_templates": [
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      "args": {},
      "expansion": "union shop (plural union shops)",
      "name": "en-noun"
    }
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
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            "Entry maintenance"
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          "source": "w"
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      "coordinate_terms": [
        {
          "sense": "place of employment requiring union membership after employment",
          "word": "closed shop"
        },
        {
          "sense": "place of employment requiring union membership after employment",
          "word": "open shop"
        },
        {
          "sense": "place of employment requiring union membership after employment",
          "word": "agency shop"
        }
      ],
      "glosses": [
        "A place of employment in which newly hired workers must join the union representing the workers within a certain period of time, typically 30 days."
      ],
      "id": "en-union_shop-en-noun-Mive6QOI"
    }
  ],
  "word": "union shop"
}

{
  "coordinate_terms": [
    {
      "sense": "place of employment requiring union membership after employment",
      "word": "closed shop"
    },
    {
      "sense": "place of employment requiring union membership after employment",
      "word": "open shop"
    },
    {
      "sense": "place of employment requiring union membership after employment",
      "word": "agency shop"
    }
  ],
  "forms": [
    {
      "form": "union shops",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "union shop (plural union shops)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
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        "Pages with entries"
      ],
      "glosses": [
        "A place of employment in which newly hired workers must join the union representing the workers within a certain period of time, typically 30 days."
      ]
    }
  ],
  "word": "union shop"
}