"harp on the same string" meaning in English

{
  "forms": [
    {
      "form": "harps on the same string",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "harping on the same string",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "harped on the same string",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "harped on the same string",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "harp on the same string (third-person singular simple present harps on the same string, present participle harping on the same string, simple past and past participle harped on the same string)",
      "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"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with French translations",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with Portuguese translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "To repeatedly say the same thing."
      ],
      "id": "en-harp_on_the_same_string-en-verb-MG2YL7Uw",
      "links": [
        [
          "repeatedly",
          "repeatedly"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To repeatedly say the same thing."
      ],
      "synonyms": [
        {
          "word": "harp on one string"
        }
      ],
      "tags": [
        "idiomatic"
      ],
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "sense": "Translations",
          "word": "chanter le même refrain"
        },
        {
          "code": "pt",
          "lang": "Portuguese",
          "sense": "Translations",
          "word": "bater na mesma tecla"
        }
      ]
    }
  ],
  "word": "harp on the same string"
}

{
  "forms": [
    {
      "form": "harps on the same string",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "harping on the same string",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "harped on the same string",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "harped on the same string",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "harp on the same string (third-person singular simple present harps on the same string, present participle harping on the same string, simple past and past participle harped on the same string)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English idioms",
        "English lemmas",
        "English multiword terms",
        "English verbs",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with French translations",
        "Terms with Portuguese translations",
        "Translation table header lacks gloss"
      ],
      "glosses": [
        "To repeatedly say the same thing."
      ],
      "links": [
        [
          "repeatedly",
          "repeatedly"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To repeatedly say the same thing."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "harp on one string"
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "sense": "Translations",
      "word": "chanter le même refrain"
    },
    {
      "code": "pt",
      "lang": "Portuguese",
      "sense": "Translations",
      "word": "bater na mesma tecla"
    }
  ],
  "word": "harp on the same string"
}