"reloj de cuco" meaning in Spanish

{
  "forms": [
    {
      "form": "relojes de cuco",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "reloj de cuco m (plural relojes de cuco)",
      "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": "topical",
          "langcode": "es",
          "name": "Clocks",
          "orig": "es:Clocks",
          "parents": [
            "Machines",
            "Timekeeping",
            "Technology",
            "Time",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "cuckoo clock"
      ],
      "id": "en-reloj_de_cuco-es-noun-GRidZOBx",
      "links": [
        [
          "cuckoo clock",
          "cuckoo clock"
        ]
      ],
      "related": [
        {
          "word": "reloj de música"
        }
      ],
      "synonyms": [
        {
          "word": "reloj cucú"
        }
      ],
      "tags": [
        "masculine"
      ],
      "wikipedia": [
        "es:reloj de cuco"
      ]
    }
  ],
  "word": "reloj de cuco"
}

{
  "forms": [
    {
      "form": "relojes de cuco",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "m"
      },
      "expansion": "reloj de cuco m (plural relojes de cuco)",
      "name": "es-noun"
    }
  ],
  "lang": "Spanish",
  "lang_code": "es",
  "pos": "noun",
  "related": [
    {
      "word": "reloj de música"
    }
  ],
  "senses": [
    {
      "categories": [
        "Spanish countable nouns",
        "Spanish entries with incorrect language header",
        "Spanish lemmas",
        "Spanish masculine nouns",
        "Spanish multiword terms",
        "Spanish nouns",
        "es:Clocks"
      ],
      "glosses": [
        "cuckoo clock"
      ],
      "links": [
        [
          "cuckoo clock",
          "cuckoo clock"
        ]
      ],
      "synonyms": [
        {
          "word": "reloj cucú"
        }
      ],
      "tags": [
        "masculine"
      ],
      "wikipedia": [
        "es:reloj de cuco"
      ]
    }
  ],
  "word": "reloj de cuco"
}