"backs to the wall" meaning in English

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  "lang_code": "en",
  "pos": "noun",
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          "ref": "2015 January 31, Daniel Taylor, “David Silva seizes point for Manchester City as Chelsea are checked”, in The Guardian (London):",
          "text": "Chelsea had set out like a team that was reluctant to blur the lines between adventure and leaving themselves open to the counterattack and, by the end, it was a full-on backs-to-the-walls operation.",
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  "word": "backs to the wall"
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  "lang_code": "en",
  "pos": "noun",
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          "word": "back to the wall"
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