"hush kit" meaning in English

{
  "forms": [
    {
      "form": "hush kits",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hush kit (plural hush kits)",
      "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": [
        {
          "ref": "2007 February, News.com.au:",
          "text": "Even though they were fitted with hush kits, the overnight freighters were the subject of repeated noise complaints.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A series of modifications made to an aircraft's engine to dampen noise."
      ],
      "id": "en-hush_kit-en-noun-jlAvzGX4",
      "links": [
        [
          "modification",
          "modification"
        ],
        [
          "aircraft",
          "aircraft"
        ],
        [
          "engine",
          "engine"
        ],
        [
          "noise",
          "noise"
        ]
      ]
    }
  ],
  "word": "hush kit"
}

{
  "forms": [
    {
      "form": "hush kits",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hush kit (plural hush kits)",
      "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",
        "English terms with quotations",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "2007 February, News.com.au:",
          "text": "Even though they were fitted with hush kits, the overnight freighters were the subject of repeated noise complaints.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A series of modifications made to an aircraft's engine to dampen noise."
      ],
      "links": [
        [
          "modification",
          "modification"
        ],
        [
          "aircraft",
          "aircraft"
        ],
        [
          "engine",
          "engine"
        ],
        [
          "noise",
          "noise"
        ]
      ]
    }
  ],
  "word": "hush kit"
}