"undercart" meaning in English

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  "etymology_text": "From under- + cart.",
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      "form": "undercarts",
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          "text": "[…] I have flown about ten hours solo on the Yale, an intermediate trainer rather like the Harvard, but without a retractable undercart and with a 350 instead of 600 horsepower engine.",
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        {
          "ref": "1955, Neville Shute, chapter 6, in The Breaking Wave, New York: William Morrow & Co:",
          "text": "I had just taken off with Red Two beside me and I had my head down in the cockpit at about two hundred feet as I got the undercart up, throttled back, and set the pitch.",
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        "An aircraft's undercarriage."
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  "word": "undercart"
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  ],
  "etymology_text": "From under- + cart.",
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          "ref": "1955, Neville Shute, chapter 6, in The Breaking Wave, New York: William Morrow & Co:",
          "text": "I had just taken off with Red Two beside me and I had my head down in the cockpit at about two hundred feet as I got the undercart up, throttled back, and set the pitch.",
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      "glosses": [
        "An aircraft's undercarriage."
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