"barrack buster" meaning in English

{
  "etymology_text": "From their use against British army and RUC barracks.",
  "forms": [
    {
      "form": "barrack busters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "barrack buster (plural barrack busters)",
      "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"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Artillery",
          "orig": "en:Artillery",
          "parents": [
            "Weapons",
            "Hunting",
            "Military",
            "Tools",
            "Human activity",
            "Society",
            "Technology",
            "Human behaviour",
            "All topics",
            "Human",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Any of several improvised mortars, developed in the 1990s by the engineering group of the Provisional Irish Republican Army"
      ],
      "id": "en-barrack_buster-en-noun--07cf4oY"
    }
  ],
  "word": "barrack buster"
}

{
  "etymology_text": "From their use against British army and RUC barracks.",
  "forms": [
    {
      "form": "barrack busters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "barrack buster (plural barrack busters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Artillery"
      ],
      "glosses": [
        "Any of several improvised mortars, developed in the 1990s by the engineering group of the Provisional Irish Republican Army"
      ]
    }
  ],
  "word": "barrack buster"
}