"dummy run" meaning in English

{
  "etymology_text": "dummy (“false”) + run (“trial, test”)",
  "forms": [
    {
      "form": "dummy runs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dummy run (plural dummy runs)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "We'll try a dummy run with a small group first, to check that it works correctly.",
          "type": "example"
        }
      ],
      "glosses": [
        "A trial or practice before the real attempt."
      ],
      "id": "en-dummy_run-en-noun--eeQ~zWz",
      "links": [
        [
          "trial",
          "trial"
        ],
        [
          "practice",
          "practice"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A trial or practice before the real attempt."
      ],
      "synonyms": [
        {
          "word": "dry run"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-dummy run.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/80/En-au-dummy_run.ogg/En-au-dummy_run.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/8/80/En-au-dummy_run.ogg"
    }
  ],
  "word": "dummy run"
}

{
  "etymology_text": "dummy (“false”) + run (“trial, test”)",
  "forms": [
    {
      "form": "dummy runs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dummy run (plural dummy runs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "text": "We'll try a dummy run with a small group first, to check that it works correctly.",
          "type": "example"
        }
      ],
      "glosses": [
        "A trial or practice before the real attempt."
      ],
      "links": [
        [
          "trial",
          "trial"
        ],
        [
          "practice",
          "practice"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A trial or practice before the real attempt."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-dummy run.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/8/80/En-au-dummy_run.ogg/En-au-dummy_run.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/8/80/En-au-dummy_run.ogg"
    }
  ],
  "synonyms": [
    {
      "word": "dry run"
    }
  ],
  "word": "dummy run"
}