"низъ" meaning in Старославянский

{
  "categories": [
    {
      "kind": "other",
      "name": "Старославянские наречия",
      "parents": [],
      "source": "w"
    }
  ],
  "etymology_text": "От ??",
  "lang": "Старославянский",
  "lang_code": "cu",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "внизу"
      ],
      "id": "ru-низъ-cu-adv-uUmXDAv-"
    },
    {
      "glosses": [
        "вниз"
      ],
      "id": "ru-низъ-cu-adv-82Z~J0ZX"
    },
    {
      "glosses": [
        "донизу"
      ],
      "id": "ru-низъ-cu-adv-2lahS4mK"
    }
  ],
  "word": "низъ"
}

{
  "categories": [
    "Старославянские наречия"
  ],
  "etymology_text": "От ??",
  "lang": "Старославянский",
  "lang_code": "cu",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "внизу"
      ]
    },
    {
      "glosses": [
        "вниз"
      ]
    },
    {
      "glosses": [
        "донизу"
      ]
    }
  ],
  "word": "низъ"
}