"rock solid" meaning in English

{
  "forms": [
    {
      "form": "more rock solid",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most rock solid",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rock solid (comparative more rock solid, superlative most rock solid)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "87 13",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "91 9",
          "kind": "other",
          "name": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "89 11",
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Physically very solid; very difficult to move."
      ],
      "id": "en-rock_solid-en-adj-5BMVZt-w",
      "synonyms": [
        {
          "_dis1": "96 4",
          "word": "rock hard"
        },
        {
          "_dis1": "96 4",
          "word": "solid as a rock"
        }
      ]
    },
    {
      "categories": [],
      "examples": [
        {
          "ref": "2016 February 9, Jill Treanor, quoting John Cryan, “Deutsche boss tells staff the bank is ‘rock solid’ as shares slide”, in The Guardian",
          "text": "Wolfgang Schäuble said on Tuesday he had “no concerns” about Deutsche Bank, speaking shortly after John Cryan, who was appointed to run Germany’s biggest bank seven months ago, sent an email to his 100,000 staff to assure them the bank was “absolutely rock solid”.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Very strong and dependable."
      ],
      "id": "en-rock_solid-en-adj-WwmSFzyo",
      "links": [
        [
          "strong",
          "strong"
        ],
        [
          "dependable",
          "dependable"
        ]
      ],
      "raw_glosses": [
        "(figuratively) Very strong and dependable."
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "word": "rock solid"
}

{
  "categories": [
    "English adjectives",
    "English compound adjectives",
    "English entries with incorrect language header",
    "English entries with language name categories using raw markup",
    "English lemmas",
    "English multiword terms",
    "English terms with non-redundant non-automated sortkeys"
  ],
  "forms": [
    {
      "form": "more rock solid",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most rock solid",
      "tags": [
        "superlative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "rock solid (comparative more rock solid, superlative most rock solid)",
      "name": "en-adj"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
      "glosses": [
        "Physically very solid; very difficult to move."
      ]
    },
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2016 February 9, Jill Treanor, quoting John Cryan, “Deutsche boss tells staff the bank is ‘rock solid’ as shares slide”, in The Guardian",
          "text": "Wolfgang Schäuble said on Tuesday he had “no concerns” about Deutsche Bank, speaking shortly after John Cryan, who was appointed to run Germany’s biggest bank seven months ago, sent an email to his 100,000 staff to assure them the bank was “absolutely rock solid”.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Very strong and dependable."
      ],
      "links": [
        [
          "strong",
          "strong"
        ],
        [
          "dependable",
          "dependable"
        ]
      ],
      "raw_glosses": [
        "(figuratively) Very strong and dependable."
      ],
      "tags": [
        "figuratively"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "rock hard"
    },
    {
      "word": "solid as a rock"
    }
  ],
  "word": "rock solid"
}