"undern-song" meaning in English

{
  "etymology_templates": [
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        "2": "ang",
        "3": "undernsang"
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      "expansion": "Old English undernsang",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old English undernsang.",
  "head_templates": [
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      "args": {
        "1": "?"
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      "expansion": "undern-song",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
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          "source": "w"
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        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Eastern Orthodoxy",
          "orig": "en:Eastern Orthodoxy",
          "parents": [
            "Orthodoxy",
            "Christianity",
            "Abrahamism",
            "Religion",
            "Culture",
            "Society",
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            "Fundamental"
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          "source": "w"
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            "Society",
            "All topics",
            "Fundamental"
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          "source": "w"
        }
      ],
      "glosses": [
        "Synonym of terce (“the service appointed for the third hour of daylight”)"
      ],
      "id": "en-undern-song-en-noun-kuBIRcTX",
      "links": [
        [
          "Roman Catholicism",
          "Roman Catholicism"
        ],
        [
          "Eastern Orthodoxy",
          "Eastern Orthodoxy"
        ],
        [
          "terce",
          "terce#English"
        ]
      ],
      "qualifier": "Eastern Orthodoxy",
      "raw_glosses": [
        "(chiefly Roman Catholicism, Eastern Orthodoxy, dated, obsolete) Synonym of terce (“the service appointed for the third hour of daylight”)"
      ],
      "synonyms": [
        {
          "extra": "the service appointed for the third hour of daylight",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "terce"
        }
      ],
      "tags": [
        "dated",
        "obsolete"
      ],
      "topics": [
        "Catholicism",
        "Christianity",
        "Roman-Catholicism"
      ]
    }
  ],
  "word": "undern-song"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "ang",
        "3": "undernsang"
      },
      "expansion": "Old English undernsang",
      "name": "inh"
    }
  ],
  "etymology_text": "From Old English undernsang.",
  "head_templates": [
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      "expansion": "undern-song",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English nouns with unknown or uncertain plurals",
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        "English terms inherited from Old English",
        "English terms with obsolete senses",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Eastern Orthodoxy",
        "en:Roman Catholicism"
      ],
      "glosses": [
        "Synonym of terce (“the service appointed for the third hour of daylight”)"
      ],
      "links": [
        [
          "Roman Catholicism",
          "Roman Catholicism"
        ],
        [
          "Eastern Orthodoxy",
          "Eastern Orthodoxy"
        ],
        [
          "terce",
          "terce#English"
        ]
      ],
      "qualifier": "Eastern Orthodoxy",
      "raw_glosses": [
        "(chiefly Roman Catholicism, Eastern Orthodoxy, dated, obsolete) Synonym of terce (“the service appointed for the third hour of daylight”)"
      ],
      "synonyms": [
        {
          "extra": "the service appointed for the third hour of daylight",
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "terce"
        }
      ],
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        "dated",
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      ],
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        "Catholicism",
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  ],
  "word": "undern-song"
}