"adsub" meaning in Ido

{
  "etymology_templates": [
    {
      "args": {
        "1": "io",
        "2": "ad",
        "3": "sub",
        "t1": "to",
        "t2": "under"
      },
      "expansion": "ad- (“to”) + sub (“under”)",
      "name": "prefix"
    }
  ],
  "etymology_text": "ad- (“to”) + sub (“under”)",
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "preposition"
      },
      "expansion": "adsub",
      "name": "head"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Ido entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ido prepositions",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Ido terms prefixed with ad-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "The mouse ran under the bed.",
          "text": "La muso kuris adsub la lito.",
          "type": "example"
        }
      ],
      "glosses": [
        "under (with motion)"
      ],
      "id": "en-adsub-io-prep-jiwLksoW",
      "links": [
        [
          "under",
          "under"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈad.sub/"
    }
  ],
  "word": "adsub"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "io",
        "2": "ad",
        "3": "sub",
        "t1": "to",
        "t2": "under"
      },
      "expansion": "ad- (“to”) + sub (“under”)",
      "name": "prefix"
    }
  ],
  "etymology_text": "ad- (“to”) + sub (“under”)",
  "head_templates": [
    {
      "args": {
        "1": "io",
        "2": "preposition"
      },
      "expansion": "adsub",
      "name": "head"
    }
  ],
  "lang": "Ido",
  "lang_code": "io",
  "pos": "prep",
  "senses": [
    {
      "categories": [
        "Ido entries with incorrect language header",
        "Ido lemmas",
        "Ido prepositions",
        "Ido terms prefixed with ad-",
        "Ido terms with usage examples",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "english": "The mouse ran under the bed.",
          "text": "La muso kuris adsub la lito.",
          "type": "example"
        }
      ],
      "glosses": [
        "under (with motion)"
      ],
      "links": [
        [
          "under",
          "under"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈad.sub/"
    }
  ],
  "word": "adsub"
}