"slush pile" meaning in English

{
  "forms": [
    {
      "form": "slush piles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "slush pile (plural slush piles)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Publishing",
          "orig": "en:Publishing",
          "parents": [
            "Industries",
            "Mass media",
            "Business",
            "Culture",
            "Media",
            "Economics",
            "Society",
            "Communication",
            "Social sciences",
            "All topics",
            "Sciences",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The set of unsolicited manuscripts sent to a publisher."
      ],
      "id": "en-slush_pile-en-noun-P3rxxQ5W",
      "links": [
        [
          "publishing",
          "publishing#Noun"
        ],
        [
          "unsolicited",
          "unsolicited"
        ],
        [
          "manuscript",
          "manuscript"
        ],
        [
          "publisher",
          "publisher"
        ]
      ],
      "raw_glosses": [
        "(publishing) The set of unsolicited manuscripts sent to a publisher."
      ],
      "topics": [
        "media",
        "publishing"
      ],
      "wikipedia": [
        "slush pile"
      ]
    }
  ],
  "word": "slush pile"
}

{
  "forms": [
    {
      "form": "slush piles",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "slush pile (plural slush piles)",
      "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",
        "en:Publishing"
      ],
      "glosses": [
        "The set of unsolicited manuscripts sent to a publisher."
      ],
      "links": [
        [
          "publishing",
          "publishing#Noun"
        ],
        [
          "unsolicited",
          "unsolicited"
        ],
        [
          "manuscript",
          "manuscript"
        ],
        [
          "publisher",
          "publisher"
        ]
      ],
      "raw_glosses": [
        "(publishing) The set of unsolicited manuscripts sent to a publisher."
      ],
      "topics": [
        "media",
        "publishing"
      ],
      "wikipedia": [
        "slush pile"
      ]
    }
  ],
  "word": "slush pile"
}