"sing-off" meaning in English

{
  "forms": [
    {
      "form": "sing-offs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sing-off (plural sing-offs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2014, Cathy Bramley, Conditional Love, page 316",
          "text": "The two of them engaged in a sing-off until they realized that both tunes had the same beat.",
          "type": "quotation"
        },
        {
          "ref": "2015, Ethan Mordden, Sing for Your Supper: The Broadway Musical in the 1930s, page 76",
          "text": "This really is Anything Goes, not just a Cole Porter sing-off using portions of the Anything Goes narrative.",
          "type": "quotation"
        },
        {
          "ref": "2015, Steve Brookstein, Getting Over the X, page 49",
          "text": "There's nothing like the life-or-death drama of an X Factor sing-off.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A competition between two or more singers where each tries to do better than the last."
      ],
      "id": "en-sing-off-en-noun-sqUc2hL6"
    }
  ],
  "word": "sing-off"
}

{
  "forms": [
    {
      "form": "sing-offs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sing-off (plural sing-offs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "2014, Cathy Bramley, Conditional Love, page 316",
          "text": "The two of them engaged in a sing-off until they realized that both tunes had the same beat.",
          "type": "quotation"
        },
        {
          "ref": "2015, Ethan Mordden, Sing for Your Supper: The Broadway Musical in the 1930s, page 76",
          "text": "This really is Anything Goes, not just a Cole Porter sing-off using portions of the Anything Goes narrative.",
          "type": "quotation"
        },
        {
          "ref": "2015, Steve Brookstein, Getting Over the X, page 49",
          "text": "There's nothing like the life-or-death drama of an X Factor sing-off.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A competition between two or more singers where each tries to do better than the last."
      ]
    }
  ],
  "word": "sing-off"
}