"under hack" meaning in English

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      "expansion": "under hack",
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  "lang_code": "en",
  "pos": "prep_phrase",
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      "examples": [
        {
          "ref": "1984, The Marine Corps Gazette, page 25:",
          "text": "If, for example, you pay your mess bills with checks which repeatedly bounce, why shouldn't you get ten days under hack, or a court martial? If you say you have insurance, and then don't, why shouldn't the commanding general recommend you for a general court martial?",
          "type": "quote"
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        {
          "ref": "1989, Verle E. Ludwig, U.S. Marines at Twentynine Palms, California, page 90:",
          "text": "Sometimes they got in the way and were \"thrown in the brig\" by Marines, or \"confined to quarters\" and \"put under hack\" by a kind, but firm father.",
          "type": "quote"
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      "glosses": [
        "under arrest"
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      "id": "en-under_hack-en-prep_phrase-15Sp0441",
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          "under arrest",
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      "qualifier": "Marine Corps",
      "raw_glosses": [
        "(US, Marine Corps, slang) under arrest"
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  "word": "under hack"
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      "expansion": "under hack",
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      "expansion": "under hack",
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          "ref": "1984, The Marine Corps Gazette, page 25:",
          "text": "If, for example, you pay your mess bills with checks which repeatedly bounce, why shouldn't you get ten days under hack, or a court martial? If you say you have insurance, and then don't, why shouldn't the commanding general recommend you for a general court martial?",
          "type": "quote"
        },
        {
          "ref": "1989, Verle E. Ludwig, U.S. Marines at Twentynine Palms, California, page 90:",
          "text": "Sometimes they got in the way and were \"thrown in the brig\" by Marines, or \"confined to quarters\" and \"put under hack\" by a kind, but firm father.",
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  "word": "under hack"
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