"grey cells" meaning in All languages combined

{
  "etymology_text": "Compare grey matter.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "grey cells pl (plural only)",
      "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": "other",
          "name": "English pluralia tantum",
          "parents": [
            "Pluralia tantum",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Brains; a person's ability to think, especially referring to intelligence."
      ],
      "id": "en-grey_cells-en-noun-2EDfANpL",
      "links": [
        [
          "Brains",
          "brains"
        ],
        [
          "think",
          "think"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Brains; a person's ability to think, especially referring to intelligence."
      ],
      "synonyms": [
        {
          "tags": [
            "US"
          ],
          "word": "gray cells"
        }
      ],
      "tags": [
        "idiomatic",
        "plural",
        "plural-only"
      ]
    }
  ],
  "word": "grey cells"
}

{
  "etymology_text": "Compare grey matter.",
  "head_templates": [
    {
      "args": {
        "1": "p"
      },
      "expansion": "grey cells pl (plural only)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English pluralia tantum",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "Brains; a person's ability to think, especially referring to intelligence."
      ],
      "links": [
        [
          "Brains",
          "brains"
        ],
        [
          "think",
          "think"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) Brains; a person's ability to think, especially referring to intelligence."
      ],
      "tags": [
        "idiomatic",
        "plural",
        "plural-only"
      ]
    }
  ],
  "synonyms": [
    {
      "tags": [
        "US"
      ],
      "word": "gray cells"
    }
  ],
  "word": "grey cells"
}

{
  "called_from": "form_description/20250107",
  "msg": "Form tags without form: desc='plural plural-only', tagsets=[('plural', 'plural-only')]",
  "path": [
    "grey cells"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "grey cells",
  "trace": ""
}