"sleeper effect" meaning in English

{
  "forms": [
    {
      "form": "sleeper effects",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "sleeper effect (plural sleeper effects)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Psychology",
          "orig": "en:Psychology",
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            "Social sciences",
            "Sciences",
            "Society",
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      ],
      "glosses": [
        "A phenomenon where the impact of a persuasive message increases over time, even though the initial impact may have been minimal or negligible, often accompanied by a discounting cue."
      ],
      "id": "en-sleeper_effect-en-noun-yXXqcsHV",
      "links": [
        [
          "psychology",
          "psychology"
        ],
        [
          "impact",
          "impact"
        ],
        [
          "persuasive",
          "persuasive"
        ],
        [
          "minimal",
          "minimal"
        ],
        [
          "negligible",
          "negligible"
        ],
        [
          "discounting",
          "discounting"
        ],
        [
          "cue",
          "cue"
        ]
      ],
      "raw_glosses": [
        "(psychology) A phenomenon where the impact of a persuasive message increases over time, even though the initial impact may have been minimal or negligible, often accompanied by a discounting cue."
      ],
      "topics": [
        "human-sciences",
        "psychology",
        "sciences"
      ]
    }
  ],
  "word": "sleeper effect"
}

{
  "forms": [
    {
      "form": "sleeper effects",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "expansion": "sleeper effect (plural sleeper effects)",
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  "lang_code": "en",
  "pos": "noun",
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        "en:Psychology"
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      "glosses": [
        "A phenomenon where the impact of a persuasive message increases over time, even though the initial impact may have been minimal or negligible, often accompanied by a discounting cue."
      ],
      "links": [
        [
          "psychology",
          "psychology"
        ],
        [
          "impact",
          "impact"
        ],
        [
          "persuasive",
          "persuasive"
        ],
        [
          "minimal",
          "minimal"
        ],
        [
          "negligible",
          "negligible"
        ],
        [
          "discounting",
          "discounting"
        ],
        [
          "cue",
          "cue"
        ]
      ],
      "raw_glosses": [
        "(psychology) A phenomenon where the impact of a persuasive message increases over time, even though the initial impact may have been minimal or negligible, often accompanied by a discounting cue."
      ],
      "topics": [
        "human-sciences",
        "psychology",
        "sciences"
      ]
    }
  ],
  "word": "sleeper effect"
}