"ill effect" meaning in English

{
  "forms": [
    {
      "form": "ill effects",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ill effect (plural ill effects)",
      "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"
        }
      ],
      "examples": [
        {
          "ref": "1961 July, “News in Brief”, in Trains Illustrated, page 392",
          "text": "All B.R. pallet vans have been withdrawn for modification; it has been found that the springing has suffered serious ill-effects from the activities of heavy fork-lift trucks inside the vehicles....",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A detrimental or harmful effect."
      ],
      "id": "en-ill_effect-en-noun-GDBn1bFn",
      "links": [
        [
          "detrimental",
          "detrimental"
        ],
        [
          "harmful",
          "harmful"
        ]
      ],
      "raw_glosses": [
        "(often plural) A detrimental or harmful effect."
      ],
      "synonyms": [
        {
          "word": "ill-effect"
        }
      ],
      "tags": [
        "often",
        "plural"
      ]
    }
  ],
  "word": "ill effect"
}

{
  "forms": [
    {
      "form": "ill effects",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "ill effect (plural ill effects)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations"
      ],
      "examples": [
        {
          "ref": "1961 July, “News in Brief”, in Trains Illustrated, page 392",
          "text": "All B.R. pallet vans have been withdrawn for modification; it has been found that the springing has suffered serious ill-effects from the activities of heavy fork-lift trucks inside the vehicles....",
          "type": "quotation"
        }
      ],
      "glosses": [
        "A detrimental or harmful effect."
      ],
      "links": [
        [
          "detrimental",
          "detrimental"
        ],
        [
          "harmful",
          "harmful"
        ]
      ],
      "raw_glosses": [
        "(often plural) A detrimental or harmful effect."
      ],
      "tags": [
        "often",
        "plural"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "ill-effect"
    }
  ],
  "word": "ill effect"
}