"hard stop" meaning in English

{
  "forms": [
    {
      "form": "hard stops",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "hard-stop",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hard stop (plural hard stops)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A mechanical device that limits the travel of a mechanism."
      ],
      "id": "en-hard_stop-en-noun-YNBwZAsF"
    },
    {
      "categories": [
        {
          "_dis": "3 27 32 38",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "5 39 34 23",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        },
        {
          "_dis": "3 43 31 24",
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "I have a hard stop at 4 pm, so please try to cover everything in the meeting before then.",
          "type": "example"
        }
      ],
      "glosses": [
        "A definite time when someone must end a task; a non-negotiable deadline."
      ],
      "id": "en-hard_stop-en-noun-SbBQNcUS",
      "links": [
        [
          "non-negotiable",
          "non-negotiable"
        ],
        [
          "deadline",
          "deadline"
        ]
      ]
    },
    {
      "categories": [
        {
          "_dis": "3 27 32 38",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "5 39 34 23",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "A tactic used by armed police to stop a vehicle believed to contain dangerous criminals."
      ],
      "id": "en-hard_stop-en-noun-2JO6QaB1"
    },
    {
      "categories": [
        {
          "_dis": "3 27 32 38",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        },
        {
          "_dis": "5 39 34 23",
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Synonym of full stop"
      ],
      "id": "en-hard_stop-en-noun-XxW~8BXx",
      "links": [
        [
          "full stop",
          "full stop#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "full stop"
        }
      ]
    }
  ],
  "word": "hard stop"
}

{
  "categories": [
    "English countable nouns",
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English nouns",
    "Pages with 1 entry",
    "Pages with entries"
  ],
  "forms": [
    {
      "form": "hard stops",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "hard-stop",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "hard stop (plural hard stops)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "glosses": [
        "A mechanical device that limits the travel of a mechanism."
      ]
    },
    {
      "categories": [
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "I have a hard stop at 4 pm, so please try to cover everything in the meeting before then.",
          "type": "example"
        }
      ],
      "glosses": [
        "A definite time when someone must end a task; a non-negotiable deadline."
      ],
      "links": [
        [
          "non-negotiable",
          "non-negotiable"
        ],
        [
          "deadline",
          "deadline"
        ]
      ]
    },
    {
      "glosses": [
        "A tactic used by armed police to stop a vehicle believed to contain dangerous criminals."
      ]
    },
    {
      "glosses": [
        "Synonym of full stop"
      ],
      "links": [
        [
          "full stop",
          "full stop#English"
        ]
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "full stop"
        }
      ]
    }
  ],
  "word": "hard stop"
}