"en proie à" meaning in French

{
  "head_templates": [
    {
      "args": {},
      "expansion": "en proie à",
      "name": "fr-adv"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "english": "50,000 civilians are affected by the battles.",
          "text": "50,000 civils sont en proie aux combats.",
          "type": "example"
        },
        {
          "english": "He was in the grip of a host of new sensations.",
          "ref": "1862, Victor Hugo, “Petit-Gervais” (chapter XIII), in Les misérables, Tome I—Fantine, Livre deuxième—La chute",
          "text": "Il était en proie à une foule de sensations nouvelles.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "in the grip of; prey to; affected by"
      ],
      "id": "en-en_proie_à-fr-adv-97iYFsex",
      "links": [
        [
          "in the grip of",
          "in the grip of"
        ],
        [
          "prey to",
          "fall prey"
        ],
        [
          "affected",
          "affected"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɑ̃ pʁwa a/"
    }
  ],
  "word": "en proie à"
}

{
  "head_templates": [
    {
      "args": {},
      "expansion": "en proie à",
      "name": "fr-adv"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "adv",
  "senses": [
    {
      "categories": [
        "French adverbs",
        "French entries with incorrect language header",
        "French lemmas",
        "French multiword terms",
        "French terms with IPA pronunciation",
        "French terms with quotations",
        "French terms with usage examples"
      ],
      "examples": [
        {
          "english": "50,000 civilians are affected by the battles.",
          "text": "50,000 civils sont en proie aux combats.",
          "type": "example"
        },
        {
          "english": "He was in the grip of a host of new sensations.",
          "ref": "1862, Victor Hugo, “Petit-Gervais” (chapter XIII), in Les misérables, Tome I—Fantine, Livre deuxième—La chute",
          "text": "Il était en proie à une foule de sensations nouvelles.",
          "type": "quotation"
        }
      ],
      "glosses": [
        "in the grip of; prey to; affected by"
      ],
      "links": [
        [
          "in the grip of",
          "in the grip of"
        ],
        [
          "prey to",
          "fall prey"
        ],
        [
          "affected",
          "affected"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/ɑ̃ pʁwa a/"
    }
  ],
  "word": "en proie à"
}