"those who can't do, teach" meaning in English

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      "expansion": "those who can't do, teach",
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      "expansion": "those who can't do, teach",
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  "lang_code": "en",
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        {
          "ref": "2004, Shirley M. Hord, Learning Together, Leading Together",
          "text": "If those who can't do, teach — then what will those who can't teach, do?",
          "type": "quotation"
        },
        {
          "ref": "2007, Roy Vincent, Listening to the Silences, page 21",
          "text": "Now, there is an unkind saying in education that “those who can, 'do'; those who can't 'do', teach; those who can't teach, teach others to teach; while those who can't teach others to teach become either education administrators or researchers”.",
          "type": "quotation"
        },
        {
          "ref": "2010, Charles J. Mertz, So,You Want To Be a Teacher, page 12",
          "text": "They say, “Those who can't do, teach.” Don't you believe it. Those who teach show those who can't how to.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "It is easier to get a job teaching how to do something than to get a job actually doing that thing."
      ],
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        "(derogatory) It is easier to get a job teaching how to do something than to get a job actually doing that thing."
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        "derogatory"
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  "word": "those who can't do, teach"
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      "expansion": "those who can't do, teach",
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      "expansion": "those who can't do, teach",
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  "lang_code": "en",
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          "text": "If those who can't do, teach — then what will those who can't teach, do?",
          "type": "quotation"
        },
        {
          "ref": "2007, Roy Vincent, Listening to the Silences, page 21",
          "text": "Now, there is an unkind saying in education that “those who can, 'do'; those who can't 'do', teach; those who can't teach, teach others to teach; while those who can't teach others to teach become either education administrators or researchers”.",
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        "(derogatory) It is easier to get a job teaching how to do something than to get a job actually doing that thing."
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  "word": "those who can't do, teach"
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