"ау" meaning in Russian

{
  "etymology_number": 1,
  "forms": [
    {
      "form": "а́у",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "áu",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "interjection",
        "head": "а́у"
      },
      "expansion": "а́у • (áu)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "_dis": "3 0 7 7 3 2 1 2 2 25 2 1 1 40 1 3 1",
          "kind": "other",
          "name": "Pages with 7 entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "2 0 8 7 1 1 0 1 1 28 1 0 0 44 1 2 0",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "98 2",
          "kind": "other",
          "name": "Russian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "— Юль! — А́у?\n— Julʹ! — Áu?\n— Yuliya! — Huh?",
          "type": "example"
        }
      ],
      "glosses": [
        "huh? (used as a response to one's name being called or to indicate not quite having heard something)"
      ],
      "id": "en-ау-ru-intj-je9JsuUJ",
      "links": [
        [
          "huh",
          "huh"
        ]
      ],
      "raw_glosses": [
        "(colloquial) huh? (used as a response to one's name being called or to indicate not quite having heard something)"
      ],
      "synonyms": [
        {
          "word": "а"
        },
        {
          "word": "а́ушки"
        }
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈaʊ]"
    }
  ],
  "word": "ау"
}

{
  "etymology_number": 2,
  "forms": [
    {
      "form": "ау́",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "aú",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "interjection",
        "head": "ау́"
      },
      "expansion": "ау́ • (aú)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "intj",
  "senses": [
    {
      "glosses": [
        "hello? (is anyone there?)"
      ],
      "id": "en-ау-ru-intj-aAlgxOOD",
      "links": [
        [
          "hello",
          "hello"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɐˈu]"
    }
  ],
  "word": "ау"
}

{
  "categories": [
    "Pages with 7 entries",
    "Pages with entries",
    "Russian entries with incorrect language header",
    "Russian interjections",
    "Russian lemmas",
    "Russian terms with IPA pronunciation"
  ],
  "etymology_number": 1,
  "forms": [
    {
      "form": "а́у",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "áu",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "interjection",
        "head": "а́у"
      },
      "expansion": "а́у • (áu)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        "Russian colloquialisms",
        "Russian terms with usage examples"
      ],
      "examples": [
        {
          "text": "— Юль! — А́у?\n— Julʹ! — Áu?\n— Yuliya! — Huh?",
          "type": "example"
        }
      ],
      "glosses": [
        "huh? (used as a response to one's name being called or to indicate not quite having heard something)"
      ],
      "links": [
        [
          "huh",
          "huh"
        ]
      ],
      "raw_glosses": [
        "(colloquial) huh? (used as a response to one's name being called or to indicate not quite having heard something)"
      ],
      "synonyms": [
        {
          "word": "а"
        },
        {
          "word": "а́ушки"
        }
      ],
      "tags": [
        "colloquial"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ˈaʊ]"
    }
  ],
  "word": "ау"
}

{
  "categories": [
    "Pages with 7 entries",
    "Pages with entries",
    "Russian entries with incorrect language header",
    "Russian interjections",
    "Russian lemmas",
    "Russian terms with IPA pronunciation"
  ],
  "etymology_number": 2,
  "forms": [
    {
      "form": "ау́",
      "tags": [
        "canonical"
      ]
    },
    {
      "form": "aú",
      "tags": [
        "romanization"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ru",
        "2": "interjection",
        "head": "ау́"
      },
      "expansion": "ау́ • (aú)",
      "name": "head"
    }
  ],
  "lang": "Russian",
  "lang_code": "ru",
  "pos": "intj",
  "senses": [
    {
      "glosses": [
        "hello? (is anyone there?)"
      ],
      "links": [
        [
          "hello",
          "hello"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[ɐˈu]"
    }
  ],
  "word": "ау"
}