"-phi" meaning in Zulu

{
  "head_templates": [
    {
      "args": {
        "1": "zu",
        "2": "adverb",
        "cat2": "interrogative adverbs"
      },
      "expansion": "-phi",
      "name": "head"
    }
  ],
  "lang": "Zulu",
  "lang_code": "zu",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "_dis": "96 4",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "97 3",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "98 2",
          "kind": "other",
          "name": "Zulu entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "where (suffixed to verb)"
      ],
      "id": "en--phi-zu-adv-dP8maHvb",
      "links": [
        [
          "where",
          "where"
        ]
      ]
    },
    {
      "categories": [],
      "examples": [
        {
          "english": "Where are you?",
          "text": "Uphi wena?",
          "type": "example"
        }
      ],
      "glosses": [
        "where is"
      ],
      "id": "en--phi-zu-adv-DTkCn71Q",
      "links": [
        [
          "where",
          "where"
        ]
      ],
      "raw_glosses": [
        "where is [+ subject concord]"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pʰí/"
    }
  ],
  "word": "-phi"
}

{
  "categories": [
    "Pages with 1 entry",
    "Pages with entries",
    "Zulu adverbs",
    "Zulu entries with incorrect language header",
    "Zulu interrogative adverbs",
    "Zulu lemmas",
    "Zulu terms with IPA pronunciation"
  ],
  "head_templates": [
    {
      "args": {
        "1": "zu",
        "2": "adverb",
        "cat2": "interrogative adverbs"
      },
      "expansion": "-phi",
      "name": "head"
    }
  ],
  "lang": "Zulu",
  "lang_code": "zu",
  "pos": "adv",
  "senses": [
    {
      "glosses": [
        "where (suffixed to verb)"
      ],
      "links": [
        [
          "where",
          "where"
        ]
      ]
    },
    {
      "categories": [
        "Zulu terms with usage examples"
      ],
      "examples": [
        {
          "english": "Where are you?",
          "text": "Uphi wena?",
          "type": "example"
        }
      ],
      "glosses": [
        "where is"
      ],
      "links": [
        [
          "where",
          "where"
        ]
      ],
      "raw_glosses": [
        "where is [+ subject concord]"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/pʰí/"
    }
  ],
  "word": "-phi"
}