"propwash deflection unit" meaning in English

{
  "forms": [
    {
      "form": "propwash deflection units",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "propwash deflection unit (plural propwash deflection units)",
      "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"
        }
      ],
      "glosses": [
        "A device that is placed over or behind the propeller of a boat to deflect the vessel's propwash downward. The result is a very effective form of agitation dredging. PDUs are primarily used by salvors to remove mud or sand from shallow water shipwrecks."
      ],
      "id": "en-propwash_deflection_unit-en-noun-luO96khD",
      "synonyms": [
        {
          "word": "deflector"
        },
        {
          "word": "PDU"
        }
      ]
    }
  ],
  "word": "propwash deflection unit"
}

{
  "forms": [
    {
      "form": "propwash deflection units",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "propwash deflection unit (plural propwash deflection units)",
      "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"
      ],
      "glosses": [
        "A device that is placed over or behind the propeller of a boat to deflect the vessel's propwash downward. The result is a very effective form of agitation dredging. PDUs are primarily used by salvors to remove mud or sand from shallow water shipwrecks."
      ]
    }
  ],
  "synonyms": [
    {
      "word": "deflector"
    },
    {
      "word": "PDU"
    }
  ],
  "word": "propwash deflection unit"
}