"dry run" meaning in English

{
  "etymology_text": "dry (“impotent; harmless”) + run. First attested in print in 1941, but apparently much older in spoken English.",
  "forms": [
    {
      "form": "dry runs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dry run (plural dry runs)",
      "name": "en-noun"
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  ],
  "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"
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          "source": "w"
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          "name": "Terms with Italian translations",
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        }
      ],
      "examples": [
        {
          "text": "They did a dry run of the demonstration before showing it to the CEO.",
          "type": "example"
        }
      ],
      "glosses": [
        "A practice; a rehearsal."
      ],
      "id": "en-dry_run-en-noun-6ByxVhu3",
      "links": [
        [
          "practice",
          "practice"
        ],
        [
          "rehearsal",
          "rehearsal"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A practice; a rehearsal."
      ],
      "synonyms": [
        {
          "word": "dummy run"
        },
        {
          "word": "dry-run"
        }
      ],
      "tags": [
        "idiomatic"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "word": "harjoitus"
        },
        {
          "code": "fi",
          "lang": "Finnish",
          "word": "kuivaharjoitus"
        },
        {
          "code": "de",
          "lang": "German",
          "word": "Probelauf"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "word": "próba"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "word": "gyakorlás"
        },
        {
          "code": "hu",
          "lang": "Hungarian",
          "word": "gyakorlat"
        },
        {
          "code": "it",
          "lang": "Italian",
          "word": "prove generali"
        },
        {
          "code": "ru",
          "lang": "Russian",
          "roman": "próbnyj progón",
          "tags": [
            "masculine"
          ],
          "word": "про́бный прого́н"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "word": "ensayo"
        },
        {
          "code": "es",
          "lang": "Spanish",
          "word": "simulacro"
        }
      ],
      "wikipedia": [
        "Michael Quinion"
      ]
    }
  ],
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    {
      "audio": "en-au-dry run.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/2/27/En-au-dry_run.ogg/En-au-dry_run.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/2/27/En-au-dry_run.ogg"
    }
  ],
  "word": "dry run"
}

{
  "etymology_text": "dry (“impotent; harmless”) + run. First attested in print in 1941, but apparently much older in spoken English.",
  "forms": [
    {
      "form": "dry runs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "dry run (plural dry runs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "Terms with Finnish translations",
        "Terms with German translations",
        "Terms with Hungarian translations",
        "Terms with Italian translations",
        "Terms with Russian translations",
        "Terms with Spanish translations"
      ],
      "examples": [
        {
          "text": "They did a dry run of the demonstration before showing it to the CEO.",
          "type": "example"
        }
      ],
      "glosses": [
        "A practice; a rehearsal."
      ],
      "links": [
        [
          "practice",
          "practice"
        ],
        [
          "rehearsal",
          "rehearsal"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) A practice; a rehearsal."
      ],
      "tags": [
        "idiomatic"
      ],
      "wikipedia": [
        "Michael Quinion"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-dry run.ogg",
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      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/2/27/En-au-dry_run.ogg"
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  ],
  "synonyms": [
    {
      "word": "dummy run"
    },
    {
      "word": "dry-run"
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "word": "harjoitus"
    },
    {
      "code": "fi",
      "lang": "Finnish",
      "word": "kuivaharjoitus"
    },
    {
      "code": "de",
      "lang": "German",
      "word": "Probelauf"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "word": "próba"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "word": "gyakorlás"
    },
    {
      "code": "hu",
      "lang": "Hungarian",
      "word": "gyakorlat"
    },
    {
      "code": "it",
      "lang": "Italian",
      "word": "prove generali"
    },
    {
      "code": "ru",
      "lang": "Russian",
      "roman": "próbnyj progón",
      "tags": [
        "masculine"
      ],
      "word": "про́бный прого́н"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "word": "ensayo"
    },
    {
      "code": "es",
      "lang": "Spanish",
      "word": "simulacro"
    }
  ],
  "word": "dry run"
}

{
  "called_from": "page/2517",
  "msg": "UNIMPLEMENTED parse_translation_template: trans-top-see {1: 'practice; rehearsal', 2: 'practice', 3: 'rehearsal'}",
  "path": [
    "dry run",
    "Template:trans-top-see",
    "TEMPLATE_FN"
  ],
  "section": "English",
  "subsection": "noun",
  "title": "dry run",
  "trace": ""
}