"sup-" meaning in Latin

{
  "categories": [
    {
      "kind": "other",
      "name": "Préfixes en latin",
      "parents": [],
      "source": "w"
    },
    {
      "kind": "other",
      "name": "Latin",
      "orig": "latin",
      "parents": [],
      "source": "w"
    }
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "prefix",
  "pos_title": "Préfixe",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sub-"
        }
      ],
      "categories": [
        {
          "kind": "other",
          "name": "Variantes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Variantes sans langue précisée",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "Variante de sub- devant un mot commençant par \\p\\ comme supplĕo"
      ],
      "id": "fr-sup--la-prefix-tdgrpCF7",
      "tags": [
        "alt-of"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\sup\\"
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "sup-"
}

{
  "categories": [
    "Préfixes en latin",
    "latin"
  ],
  "lang": "Latin",
  "lang_code": "la",
  "pos": "prefix",
  "pos_title": "Préfixe",
  "senses": [
    {
      "alt_of": [
        {
          "word": "sub-"
        }
      ],
      "categories": [
        "Variantes",
        "Variantes sans langue précisée"
      ],
      "glosses": [
        "Variante de sub- devant un mot commençant par \\p\\ comme supplĕo"
      ],
      "tags": [
        "alt-of"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "\\sup\\"
    }
  ],
  "tags": [
    "morpheme"
  ],
  "word": "sup-"
}