"bu" meaning in Mizo

{
  "derived": [
    {
      "_dis1": "0 0",
      "word": "lehkhabu"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "lus",
        "2": "tbq-kuk-pro",
        "3": "*buu",
        "t": "nest"
      },
      "expansion": "Proto-Kuki-Chin *buu (“nest”)",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Kuki-Chin *buu (“nest”).",
  "head_templates": [
    {
      "args": {
        "1": "lus",
        "2": "noun"
      },
      "expansion": "bu",
      "name": "head"
    }
  ],
  "lang": "Mizo",
  "lang_code": "lus",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Mizo entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "nest"
      ],
      "id": "en-bu-lus-noun-de8uMpvb",
      "links": [
        [
          "nest",
          "nest"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "50 50",
          "kind": "other",
          "name": "Mizo entries with incorrect language header",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "bunch"
      ],
      "id": "en-bu-lus-noun-vn8lHCXE",
      "links": [
        [
          "bunch",
          "bunch"
        ]
      ]
    }
  ],
  "word": "bu"
}

{
  "categories": [
    "Mizo entries with incorrect language header",
    "Mizo lemmas",
    "Mizo nouns",
    "Mizo terms derived from Proto-Kuki-Chin",
    "Mizo terms inherited from Proto-Kuki-Chin",
    "Pages with 65 entries",
    "Pages with entries",
    "zom:Animal dwellings",
    "zom:Buildings",
    "zom:Foods"
  ],
  "derived": [
    {
      "word": "lehkhabu"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "lus",
        "2": "tbq-kuk-pro",
        "3": "*buu",
        "t": "nest"
      },
      "expansion": "Proto-Kuki-Chin *buu (“nest”)",
      "name": "inh"
    }
  ],
  "etymology_text": "From Proto-Kuki-Chin *buu (“nest”).",
  "head_templates": [
    {
      "args": {
        "1": "lus",
        "2": "noun"
      },
      "expansion": "bu",
      "name": "head"
    }
  ],
  "lang": "Mizo",
  "lang_code": "lus",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "nest"
      ],
      "links": [
        [
          "nest",
          "nest"
        ]
      ]
    },
    {
      "glosses": [
        "bunch"
      ],
      "links": [
        [
          "bunch",
          "bunch"
        ]
      ]
    }
  ],
  "word": "bu"
}