"backdoor" meaning in English

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      "expansion": "From back + door.",
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  "etymology_text": "From back + door.",
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      "form": "backdoors",
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          "ref": "2021 September 8, “Network News: SWR accused of \"backdoor price hikes\"”, in RAIL, number 939, page 12:",
          "text": "South Western Railway is introducing \"backdoor price hikes\" of \"up to 28%\" from September 5, claims pressure group SWR Watch, which has asked the operator: \"When were you going to tell passengers?\"",
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        {
          "word": "backdoor pilot"
        },
        {
          "word": "backdoor progression"
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          "word": "backdoor trots"
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  "word": "backdoor"
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  "etymology_text": "From back + door.",
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      "form": "backdooring",
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        "participle",
        "present"
      ]
    },
    {
      "form": "backdoored",
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        "participle",
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      "form": "backdoored",
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  "etymology_text": "From back + door.",
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