"underspeed" meaning in English

{
  "antonyms": [
    {
      "word": "overspeed"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under-",
        "3": "speed"
      },
      "expansion": "under- + speed",
      "name": "af"
    }
  ],
  "etymology_text": "From under- + speed.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "underspeed (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with under-",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "1961 August, “The English Electric Type 5 3,300 h.p. \"Deltic\" diesels for British Railways”, in Trains Illustrated, page 469",
          "text": "An underspeed switch drops the load off if engine speed falls to 380 r.p.m. and an overspeed governor shuts the engine off if its speed rises above 1,700 r.p.m.",
          "type": "quotation"
        },
        {
          "ref": "2006 October 10, NASA, “2.2.1 Voice Calls”, in Intact Ascent Aborts Workbook 21002, archived from the original on 2022-06-25, page 2-3",
          "text": "These boundaries can vary from prelaunch predictions due to changing atmospheric conditions and variations in SRB and main engine performance. Using this real-time information, a computer and software program called the Abort Region Determinator (ARD) allows MCC to predict the underspeed that will result from a loss of performance (engine failure, throttle lockup, degraded thrust, etc.). This information is then used to predict the actual abort mode boundaries on which the real-time voice calls are made. These boundaries vary from pre-flight predicted boundaries.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An excessively-low speed; a speed lower than the minimum operating speed."
      ],
      "id": "en-underspeed-en-noun-eGDZAeDh",
      "links": [
        [
          "speed",
          "speed"
        ],
        [
          "lower",
          "lower"
        ],
        [
          "minimum",
          "minimum"
        ],
        [
          "operating",
          "operating"
        ]
      ],
      "tags": [
        "uncountable"
      ],
      "translations": [
        {
          "code": "fi",
          "lang": "Finnish",
          "sense": "speed lower than the limit",
          "word": "alinopeus"
        }
      ]
    }
  ],
  "word": "underspeed"
}

{
  "antonyms": [
    {
      "word": "overspeed"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "under-",
        "3": "speed"
      },
      "expansion": "under- + speed",
      "name": "af"
    }
  ],
  "etymology_text": "From under- + speed.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "underspeed (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English terms prefixed with under-",
        "English terms with quotations",
        "English uncountable nouns"
      ],
      "examples": [
        {
          "ref": "1961 August, “The English Electric Type 5 3,300 h.p. \"Deltic\" diesels for British Railways”, in Trains Illustrated, page 469",
          "text": "An underspeed switch drops the load off if engine speed falls to 380 r.p.m. and an overspeed governor shuts the engine off if its speed rises above 1,700 r.p.m.",
          "type": "quotation"
        },
        {
          "ref": "2006 October 10, NASA, “2.2.1 Voice Calls”, in Intact Ascent Aborts Workbook 21002, archived from the original on 2022-06-25, page 2-3",
          "text": "These boundaries can vary from prelaunch predictions due to changing atmospheric conditions and variations in SRB and main engine performance. Using this real-time information, a computer and software program called the Abort Region Determinator (ARD) allows MCC to predict the underspeed that will result from a loss of performance (engine failure, throttle lockup, degraded thrust, etc.). This information is then used to predict the actual abort mode boundaries on which the real-time voice calls are made. These boundaries vary from pre-flight predicted boundaries.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "An excessively-low speed; a speed lower than the minimum operating speed."
      ],
      "links": [
        [
          "speed",
          "speed"
        ],
        [
          "lower",
          "lower"
        ],
        [
          "minimum",
          "minimum"
        ],
        [
          "operating",
          "operating"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "translations": [
    {
      "code": "fi",
      "lang": "Finnish",
      "sense": "speed lower than the limit",
      "word": "alinopeus"
    }
  ],
  "word": "underspeed"
}