"safety school" meaning in English

{
  "forms": [
    {
      "form": "safety schools",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "safety school (plural safety schools)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "American English",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The least desired among the colleges and universities that one applies to for admission, chosen as a contingency in case one is rejected from all others."
      ],
      "id": "en-safety_school-en-noun-ybdJwwRY",
      "links": [
        [
          "college",
          "college"
        ],
        [
          "universities",
          "university"
        ],
        [
          "admission",
          "admission"
        ],
        [
          "contingency",
          "contingency"
        ]
      ],
      "raw_glosses": [
        "(US, colloquial) The least desired among the colleges and universities that one applies to for admission, chosen as a contingency in case one is rejected from all others."
      ],
      "tags": [
        "US",
        "colloquial"
      ]
    }
  ],
  "word": "safety school"
}

{
  "forms": [
    {
      "form": "safety schools",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "safety school (plural safety schools)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "American English",
        "English colloquialisms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns"
      ],
      "glosses": [
        "The least desired among the colleges and universities that one applies to for admission, chosen as a contingency in case one is rejected from all others."
      ],
      "links": [
        [
          "college",
          "college"
        ],
        [
          "universities",
          "university"
        ],
        [
          "admission",
          "admission"
        ],
        [
          "contingency",
          "contingency"
        ]
      ],
      "raw_glosses": [
        "(US, colloquial) The least desired among the colleges and universities that one applies to for admission, chosen as a contingency in case one is rejected from all others."
      ],
      "tags": [
        "US",
        "colloquial"
      ]
    }
  ],
  "word": "safety school"
}