"mano dura" meaning in Spanish

{
  "forms": [
    {
      "form": "manos duras",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "mano dura f (plural manos duras)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Spanish entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Spanish nouns with irregular gender",
          "parents": [
            "Nouns with irregular gender",
            "Irregular nouns",
            "Nouns by inflection type",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "iron fist; iron hand"
      ],
      "id": "en-mano_dura-es-noun-SEXFbtTr",
      "links": [
        [
          "iron fist",
          "iron fist"
        ],
        [
          "iron hand",
          "iron hand"
        ]
      ],
      "synonyms": [
        {
          "word": "puño de hierro"
        },
        {
          "word": "ordeno y mando"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "word": "mano dura"
}

{
  "forms": [
    {
      "form": "manos duras",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "mano dura f (plural manos duras)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish feminine nouns",
        "Spanish lemmas",
        "Spanish multiword terms",
        "Spanish nouns",
        "Spanish nouns with irregular gender",
        "Spanish nouns with red links in their headword lines"
      ],
      "glosses": [
        "iron fist; iron hand"
      ],
      "links": [
        [
          "iron fist",
          "iron fist"
        ],
        [
          "iron hand",
          "iron hand"
        ]
      ],
      "synonyms": [
        {
          "word": "puño de hierro"
        },
        {
          "word": "ordeno y mando"
        }
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "word": "mano dura"
}