"lost ground" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "2019 February 10, Phil McNulty, “Manchester City 6-0 Chelsea”, in BBC Sport:",
          "text": "Liverpool still have a game in hand but City have made up most of that lost ground and this was a resounding message that they will not be handing over the title.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A portion of a lead or advantage that has been subsequently lost."
      ],
      "id": "en-lost_ground-en-noun-K4bqNFyJ",
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  "word": "lost ground"
}

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      "expansion": "lost ground (uncountable)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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      "examples": [
        {
          "ref": "2019 February 10, Phil McNulty, “Manchester City 6-0 Chelsea”, in BBC Sport:",
          "text": "Liverpool still have a game in hand but City have made up most of that lost ground and this was a resounding message that they will not be handing over the title.",
          "type": "quote"
        }
      ],
      "glosses": [
        "A portion of a lead or advantage that has been subsequently lost."
      ],
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  "word": "lost ground"
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