"-in-waiting" meaning in English

{
  "derived": [
    {
      "_dis1": "44 44 12",
      "word": "baroness-in-waiting"
    },
    {
      "_dis1": "44 44 12",
      "word": "groom-in-waiting"
    },
    {
      "_dis1": "44 44 12",
      "word": "lady-in-waiting"
    },
    {
      "_dis1": "44 44 12",
      "word": "maid-in-waiting"
    },
    {
      "_dis1": "44 44 12",
      "word": "lord-in-waiting"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "suffix",
        "cat2": "",
        "cat3": "",
        "head": "-in-waiting",
        "id": ""
      },
      "expansion": "-in-waiting",
      "name": "head"
    },
    {
      "args": {
        "head": "-in-waiting"
      },
      "expansion": "-in-waiting",
      "name": "en-suffix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "suffix",
  "related": [
    {
      "_dis1": "44 44 12",
      "word": "accident waiting to happen"
    },
    {
      "_dis1": "44 44 12",
      "word": "wait in the wings"
    }
  ],
  "senses": [
    {
      "categories": [
        {
          "_dis": "51 48 1",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "ref": "1999, David Foster Wallace, “Suicide as a Sort of Present”, in Brief Interviews with Hideous Men, Little, Brown and Company",
          "text": "Throughout her adolescence, authorities... commented that the young mother-in-waiting 'seem[ed] to have very, very high expectations of [her]self,' and... there was no failing to discern in them that slight unmistakable note of approval... and at any rate the future mother felt (for the moment) approved.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Depending on the expected arrival of a result, confirmation, etc."
      ],
      "id": "en--in-waiting-en-suffix-xf8u9CQy",
      "links": [
        [
          "Depending",
          "depend"
        ],
        [
          "expected",
          "expected"
        ],
        [
          "arrival",
          "arrival"
        ],
        [
          "result",
          "result"
        ],
        [
          "confirmation",
          "confirmation"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "51 48 1",
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "examples": [
        {
          "text": "Choosing such an unqualified person to operate the machine is an accident-in-waiting.",
          "type": "example"
        }
      ],
      "glosses": [
        "About to happen; bound to happen."
      ],
      "id": "en--in-waiting-en-suffix-iD3OkTXY",
      "links": [
        [
          "bound to",
          "bound to"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "Attendant to a royal figure."
      ],
      "id": "en--in-waiting-en-suffix-le9vvAQ8",
      "links": [
        [
          "Attendant",
          "attendant"
        ],
        [
          "royal",
          "royal"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-in-waiting"
}

{
  "categories": [
    "English entries with incorrect language header",
    "English lemmas",
    "English multiword terms",
    "English suffixes"
  ],
  "derived": [
    {
      "word": "baroness-in-waiting"
    },
    {
      "word": "groom-in-waiting"
    },
    {
      "word": "lady-in-waiting"
    },
    {
      "word": "maid-in-waiting"
    },
    {
      "word": "lord-in-waiting"
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "suffix",
        "cat2": "",
        "cat3": "",
        "head": "-in-waiting",
        "id": ""
      },
      "expansion": "-in-waiting",
      "name": "head"
    },
    {
      "args": {
        "head": "-in-waiting"
      },
      "expansion": "-in-waiting",
      "name": "en-suffix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "suffix",
  "related": [
    {
      "word": "accident waiting to happen"
    },
    {
      "word": "wait in the wings"
    }
  ],
  "senses": [
    {
      "categories": [
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1999, David Foster Wallace, “Suicide as a Sort of Present”, in Brief Interviews with Hideous Men, Little, Brown and Company",
          "text": "Throughout her adolescence, authorities... commented that the young mother-in-waiting 'seem[ed] to have very, very high expectations of [her]self,' and... there was no failing to discern in them that slight unmistakable note of approval... and at any rate the future mother felt (for the moment) approved.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Depending on the expected arrival of a result, confirmation, etc."
      ],
      "links": [
        [
          "Depending",
          "depend"
        ],
        [
          "expected",
          "expected"
        ],
        [
          "arrival",
          "arrival"
        ],
        [
          "result",
          "result"
        ],
        [
          "confirmation",
          "confirmation"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        "English terms with usage examples"
      ],
      "examples": [
        {
          "text": "Choosing such an unqualified person to operate the machine is an accident-in-waiting.",
          "type": "example"
        }
      ],
      "glosses": [
        "About to happen; bound to happen."
      ],
      "links": [
        [
          "bound to",
          "bound to"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "glosses": [
        "Attendant to a royal figure."
      ],
      "links": [
        [
          "Attendant",
          "attendant"
        ],
        [
          "royal",
          "royal"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    }
  ],
  "word": "-in-waiting"
}