"desôs" meaning in Bourguignon

{
  "etymology_templates": [
    {
      "args": {
        "1": "roa-brg",
        "2": "de",
        "3": "sôs"
      },
      "expansion": "de + sôs",
      "name": "compound"
    }
  ],
  "etymology_text": "From de + sôs.",
  "head_templates": [
    {
      "args": {
        "1": "roa-brg",
        "2": "preposition"
      },
      "expansion": "desôs",
      "name": "head"
    }
  ],
  "lang": "Bourguignon",
  "lang_code": "roa-brg",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Bourguignon entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Bourguignon prepositions",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "an-desôs"
        }
      ],
      "glosses": [
        "underneath"
      ],
      "id": "en-desôs-roa-brg-prep-SedjVhbg",
      "links": [
        [
          "underneath",
          "underneath"
        ]
      ]
    }
  ],
  "word": "desôs"
}

{
  "derived": [
    {
      "word": "an-desôs"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "roa-brg",
        "2": "de",
        "3": "sôs"
      },
      "expansion": "de + sôs",
      "name": "compound"
    }
  ],
  "etymology_text": "From de + sôs.",
  "head_templates": [
    {
      "args": {
        "1": "roa-brg",
        "2": "preposition"
      },
      "expansion": "desôs",
      "name": "head"
    }
  ],
  "lang": "Bourguignon",
  "lang_code": "roa-brg",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        "Bourguignon compound terms",
        "Bourguignon entries with incorrect language header",
        "Bourguignon lemmas",
        "Bourguignon prepositions"
      ],
      "glosses": [
        "underneath"
      ],
      "links": [
        [
          "underneath",
          "underneath"
        ]
      ]
    }
  ],
  "word": "desôs"
}