"if and when" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "conj",
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      "examples": [
        {
          "ref": "1819, John Wilson, Cases in Chancery [1818-1819], page 90",
          "text": "[T]o his son Thomas Battersbee, if and when he should attain the age of 21; but if he should die under that age then to his daughter Sophia, if and when she should attain that age...",
          "type": "quotation"
        },
        {
          "ref": "1980, Louise Bates Ames, Frances Lillian Ilg, Your Three-year-old: Friend Or Enemy, page 81",
          "text": "Since, as many parents have found to their sorrow, you cannot force a child to sleep, most find it easier on everybody to accept this nightwalking if and when it occurs",
          "type": "quotation"
        },
        {
          "ref": "2006, Dennis D. Riley, Bryan E. Brophy-Baermann, Bureaucracy and the Policy Process: Keeping the Promises, page 318",
          "text": "Still, one cannot completely ignore the differences in the nature of the paper trail the two sets of rules give us if and when we want to look back at a particular decision.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "At the time of an event, contingent on that event happening at all."
      ],
      "id": "en-if_and_when-en-conj-bMWG8dF8",
      "links": [
        [
          "time",
          "time"
        ],
        [
          "contingent",
          "contingent"
        ]
      ],
      "related": [
        {
          "word": "if and only if"
        }
      ]
    }
  ],
  "word": "if and when"
}

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    {
      "args": {},
      "expansion": "if and when",
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  "lang": "English",
  "lang_code": "en",
  "pos": "conj",
  "related": [
    {
      "word": "if and only if"
    }
  ],
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        "English coordinated pairs",
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      "examples": [
        {
          "ref": "1819, John Wilson, Cases in Chancery [1818-1819], page 90",
          "text": "[T]o his son Thomas Battersbee, if and when he should attain the age of 21; but if he should die under that age then to his daughter Sophia, if and when she should attain that age...",
          "type": "quotation"
        },
        {
          "ref": "1980, Louise Bates Ames, Frances Lillian Ilg, Your Three-year-old: Friend Or Enemy, page 81",
          "text": "Since, as many parents have found to their sorrow, you cannot force a child to sleep, most find it easier on everybody to accept this nightwalking if and when it occurs",
          "type": "quotation"
        },
        {
          "ref": "2006, Dennis D. Riley, Bryan E. Brophy-Baermann, Bureaucracy and the Policy Process: Keeping the Promises, page 318",
          "text": "Still, one cannot completely ignore the differences in the nature of the paper trail the two sets of rules give us if and when we want to look back at a particular decision.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "At the time of an event, contingent on that event happening at all."
      ],
      "links": [
        [
          "time",
          "time"
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          "contingent",
          "contingent"
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  "word": "if and when"
}