"сайн уу" meaning in Mongolian

{
  "forms": [
    {
      "form": "sajn uu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "ᠰᠠᠶᠢᠨ ᠤᠤ",
      "roman": "sayin -uu",
      "tags": [
        "Mongolian"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ᠰᠠᠶᠢᠨ  ᠤᠤ"
      },
      "expansion": "сайн уу • (sajn uu) (Mongolian spelling ᠰᠠᠶᠢᠨ\n ᠤᠤ (sayin -uu))",
      "name": "mn-interjection"
    }
  ],
  "hyphenation": [
    "сайн"
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "intj",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Mongolian entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mongolian greetings",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Mongolian terms with redundant script codes",
          "parents": [
            "Terms with redundant script codes",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "hello, how are you"
      ],
      "id": "en-сайн_уу-mn-intj-ipY68YN-",
      "links": [
        [
          "hello",
          "hello"
        ],
        [
          "how are you",
          "how are you"
        ]
      ],
      "raw_glosses": [
        "(informal) hello, how are you"
      ],
      "related": [
        {
          "roman": "sajn bajna uu?",
          "tags": [
            "formal"
          ],
          "word": "сайн байна уу?"
        }
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsɛːŋ ʊː/"
    }
  ],
  "word": "сайн уу"
}

{
  "forms": [
    {
      "form": "sajn uu",
      "tags": [
        "romanization"
      ]
    },
    {
      "form": "ᠰᠠᠶᠢᠨ ᠤᠤ",
      "roman": "sayin -uu",
      "tags": [
        "Mongolian"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "ᠰᠠᠶᠢᠨ  ᠤᠤ"
      },
      "expansion": "сайн уу • (sajn uu) (Mongolian spelling ᠰᠠᠶᠢᠨ\n ᠤᠤ (sayin -uu))",
      "name": "mn-interjection"
    }
  ],
  "hyphenation": [
    "сайн"
  ],
  "lang": "Mongolian",
  "lang_code": "mn",
  "pos": "intj",
  "related": [
    {
      "roman": "sajn bajna uu?",
      "tags": [
        "formal"
      ],
      "word": "сайн байна уу?"
    }
  ],
  "senses": [
    {
      "categories": [
        "Mongolian entries with incorrect language header",
        "Mongolian greetings",
        "Mongolian informal terms",
        "Mongolian interjections",
        "Mongolian lemmas",
        "Mongolian multiword terms",
        "Mongolian terms with IPA pronunciation",
        "Mongolian terms with redundant script codes",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "hello, how are you"
      ],
      "links": [
        [
          "hello",
          "hello"
        ],
        [
          "how are you",
          "how are you"
        ]
      ],
      "raw_glosses": [
        "(informal) hello, how are you"
      ],
      "tags": [
        "informal"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ˈsɛːŋ ʊː/"
    }
  ],
  "word": "сайн уу"
}