"prest money" meaning in English

{
  "etymology_text": "So called because it bound those that received it to be ready for service when called upon.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "prest money (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"
        }
      ],
      "glosses": [
        "Money paid to men when they enlisted into the British service."
      ],
      "id": "en-prest_money-en-noun-zv944DMe",
      "links": [
        [
          "enlist",
          "enlist"
        ]
      ],
      "raw_glosses": [
        "(historical) Money paid to men when they enlisted into the British service."
      ],
      "synonyms": [
        {
          "word": "press money"
        }
      ],
      "tags": [
        "historical",
        "uncountable"
      ]
    }
  ],
  "word": "prest money"
}

{
  "etymology_text": "So called because it bound those that received it to be ready for service when called upon.",
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "prest money (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "English uncountable nouns"
      ],
      "glosses": [
        "Money paid to men when they enlisted into the British service."
      ],
      "links": [
        [
          "enlist",
          "enlist"
        ]
      ],
      "raw_glosses": [
        "(historical) Money paid to men when they enlisted into the British service."
      ],
      "tags": [
        "historical",
        "uncountable"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "press money"
    }
  ],
  "word": "prest money"
}