"drop off the radar" meaning in English

{
  "forms": [
    {
      "form": "drops off the radar",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "dropping off the radar",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "dropped off the radar",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "dropped off the radar",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "drop off the radar (third-person singular simple present drops off the radar, present participle dropping off the radar, simple past and past participle dropped off the radar)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "ref": "2003, Daniel Bukszpan, Ronnie James Dio, The Encyclopedia of Heavy Metal",
          "text": "Not long after that, the band seemed to drop off the radar entirely, leading many to assume that they had broken up...",
          "type": "quotation"
        },
        {
          "ref": "2006, Laurie Pasiuk, Vault Guide to the Top Internet Industry Employers",
          "text": "So why have users stuck with the site when so many other search engines have dropped off the radar? Well, they're not logging on just for the search engine.",
          "type": "quotation"
        },
        {
          "text": "5 December 2009, Toronto Star - One-hit wonders make a musical smash\nGreenbaum didn't dramatically drop off the radar as soon as that song peaked, but kept slogging away for five years with diminishing returns..."
        }
      ],
      "glosses": [
        "To vanish or fall into obscurity."
      ],
      "id": "en-drop_off_the_radar-en-verb-~hP~BnPX",
      "links": [
        [
          "vanish",
          "vanish"
        ],
        [
          "obscurity",
          "obscurity"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To vanish or fall into obscurity."
      ],
      "related": [
        {
          "word": "off the radar"
        },
        {
          "word": "under the radar"
        }
      ],
      "synonyms": [
        {
          "word": "drop off the map"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-drop off the radar.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/d/de/En-au-drop_off_the_radar.ogg/En-au-drop_off_the_radar.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/d/de/En-au-drop_off_the_radar.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "drop off the radar"
}

{
  "forms": [
    {
      "form": "drops off the radar",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "dropping off the radar",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "dropped off the radar",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "dropped off the radar",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "drop off the radar (third-person singular simple present drops off the radar, present participle dropping off the radar, simple past and past participle dropped off the radar)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "off the radar"
    },
    {
      "word": "under the radar"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English terms with audio links",
        "English terms with quotations",
        "English verbs",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2003, Daniel Bukszpan, Ronnie James Dio, The Encyclopedia of Heavy Metal",
          "text": "Not long after that, the band seemed to drop off the radar entirely, leading many to assume that they had broken up...",
          "type": "quotation"
        },
        {
          "ref": "2006, Laurie Pasiuk, Vault Guide to the Top Internet Industry Employers",
          "text": "So why have users stuck with the site when so many other search engines have dropped off the radar? Well, they're not logging on just for the search engine.",
          "type": "quotation"
        },
        {
          "text": "5 December 2009, Toronto Star - One-hit wonders make a musical smash\nGreenbaum didn't dramatically drop off the radar as soon as that song peaked, but kept slogging away for five years with diminishing returns..."
        }
      ],
      "glosses": [
        "To vanish or fall into obscurity."
      ],
      "links": [
        [
          "vanish",
          "vanish"
        ],
        [
          "obscurity",
          "obscurity"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To vanish or fall into obscurity."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "en-au-drop off the radar.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/d/de/En-au-drop_off_the_radar.ogg/En-au-drop_off_the_radar.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/d/de/En-au-drop_off_the_radar.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "synonyms": [
    {
      "word": "drop off the map"
    }
  ],
  "word": "drop off the radar"
}