"stad achter de duinen" meaning in Dutch

{
  "etymology_text": "Literally \"city behind the dunes\", from the city's location on the North Sea coast. Popularized by the 1982 song O, o, Den Haag, which features the line O, o, Den Haag, mooie stad achter de duinen in its chorus.",
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "stad achter de duinen f",
      "name": "nl-proper noun"
    }
  ],
  "lang": "Dutch",
  "lang_code": "nl",
  "pos": "name",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Dutch entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "place",
          "langcode": "nl",
          "name": "City nicknames",
          "orig": "nl:City nicknames",
          "parents": [
            "Cities",
            "Nicknames",
            "Polities",
            "Names",
            "Places",
            "All topics",
            "Proper nouns",
            "Terms by semantic function",
            "Fundamental",
            "Nouns",
            "Lemmas"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The Hague"
      ],
      "id": "en-stad_achter_de_duinen-nl-name-TPOIkxUy",
      "links": [
        [
          "The Hague",
          "The Hague"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) The Hague"
      ],
      "synonyms": [
        {
          "word": "Den Haag"
        }
      ],
      "tags": [
        "feminine",
        "idiomatic"
      ]
    }
  ],
  "word": "stad achter de duinen"
}

{
  "etymology_text": "Literally \"city behind the dunes\", from the city's location on the North Sea coast. Popularized by the 1982 song O, o, Den Haag, which features the line O, o, Den Haag, mooie stad achter de duinen in its chorus.",
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "stad achter de duinen f",
      "name": "nl-proper noun"
    }
  ],
  "lang": "Dutch",
  "lang_code": "nl",
  "pos": "name",
  "senses": [
    {
      "categories": [
        "Dutch entries with incorrect language header",
        "Dutch feminine nouns",
        "Dutch idioms",
        "Dutch lemmas",
        "Dutch multiword terms",
        "Dutch proper nouns",
        "nl:City nicknames"
      ],
      "glosses": [
        "The Hague"
      ],
      "links": [
        [
          "The Hague",
          "The Hague"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) The Hague"
      ],
      "synonyms": [
        {
          "word": "Den Haag"
        }
      ],
      "tags": [
        "feminine",
        "idiomatic"
      ]
    }
  ],
  "word": "stad achter de duinen"
}