"rare groove" meaning in English

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      "expansion": "rare groove (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "langcode": "en",
          "name": "Music",
          "orig": "en:Music",
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      "examples": [
        {
          "ref": "2011, Simon Reynolds, Bring the Noise: 20 Years of Writing About Hip Rock and Hip Hop",
          "text": "The brainchild of DJ Gilles Peterson, it specializes in a dance-oriented fusion of rap, rare groove and jazz, combined with 'motivational' lyrics.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Soul or jazz music that is very hard to source or relatively obscure."
      ],
      "id": "en-rare_groove-en-noun-rRbcNRhe",
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          "music",
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          "Soul",
          "soul"
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        [
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        ]
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      "raw_glosses": [
        "(music) Soul or jazz music that is very hard to source or relatively obscure."
      ],
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        "entertainment",
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      "wikipedia": [
        "rare groove"
      ]
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  "word": "rare groove"
}

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      "expansion": "rare groove (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "ref": "2011, Simon Reynolds, Bring the Noise: 20 Years of Writing About Hip Rock and Hip Hop",
          "text": "The brainchild of DJ Gilles Peterson, it specializes in a dance-oriented fusion of rap, rare groove and jazz, combined with 'motivational' lyrics.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Soul or jazz music that is very hard to source or relatively obscure."
      ],
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        [
          "music",
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        ],
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          "soul"
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        ]
      ],
      "raw_glosses": [
        "(music) Soul or jazz music that is very hard to source or relatively obscure."
      ],
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      "topics": [
        "entertainment",
        "lifestyle",
        "music"
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      "wikipedia": [
        "rare groove"
      ]
    }
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  "word": "rare groove"
}