"narrow down" meaning in English

{
  "forms": [
    {
      "form": "narrows down",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "narrowing down",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "narrowed down",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "narrowed down",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "narrow down (third-person singular simple present narrows down, present participle narrowing down, simple past and past participle narrowed down)",
      "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": "English phrasal verbs with particle (down)",
          "parents": [],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "All the food on the menu looked delicious, so I tried to narrow down my choices to only healthy foods.",
          "type": "example"
        },
        {
          "text": "After consulting with witnesses, the police narrowed down the suspects to those who had facial hair.",
          "type": "example"
        }
      ],
      "glosses": [
        "To make more specific."
      ],
      "id": "en-narrow_down-en-verb-kZI~l~Hf",
      "links": [
        [
          "specific",
          "specific"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To make more specific."
      ],
      "tags": [
        "idiomatic"
      ],
      "translations": [
        {
          "code": "bg",
          "lang": "Bulgarian",
          "roman": "sveždam do",
          "sense": "to make more specific",
          "word": "свеждам до"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "to make more specific",
          "word": "einengen"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "to make more specific",
          "word": "eingrenzen"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "to make more specific",
          "word": "einschränken"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "to make more specific",
          "word": "zuspitzen"
        },
        {
          "code": "la",
          "lang": "Latin",
          "sense": "to make more specific",
          "word": "angustō"
        },
        {
          "code": "tr",
          "lang": "Turkish",
          "sense": "to make more specific",
          "word": "daraltmak"
        }
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-narrow down.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/d/d4/En-au-narrow_down.ogg/En-au-narrow_down.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/d/d4/En-au-narrow_down.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "narrow down"
}

{
  "forms": [
    {
      "form": "narrows down",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "narrowing down",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "narrowed down",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "narrowed down",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "narrow down (third-person singular simple present narrows down, present participle narrowing down, simple past and past participle narrowed down)",
      "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 phrasal verbs",
        "English phrasal verbs with particle (down)",
        "English terms with audio links",
        "English terms with usage examples",
        "English verbs"
      ],
      "examples": [
        {
          "text": "All the food on the menu looked delicious, so I tried to narrow down my choices to only healthy foods.",
          "type": "example"
        },
        {
          "text": "After consulting with witnesses, the police narrowed down the suspects to those who had facial hair.",
          "type": "example"
        }
      ],
      "glosses": [
        "To make more specific."
      ],
      "links": [
        [
          "specific",
          "specific"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To make more specific."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-narrow down.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/d/d4/En-au-narrow_down.ogg/En-au-narrow_down.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/d/d4/En-au-narrow_down.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "translations": [
    {
      "code": "bg",
      "lang": "Bulgarian",
      "roman": "sveždam do",
      "sense": "to make more specific",
      "word": "свеждам до"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "to make more specific",
      "word": "einengen"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "to make more specific",
      "word": "eingrenzen"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "to make more specific",
      "word": "einschränken"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "to make more specific",
      "word": "zuspitzen"
    },
    {
      "code": "la",
      "lang": "Latin",
      "sense": "to make more specific",
      "word": "angustō"
    },
    {
      "code": "tr",
      "lang": "Turkish",
      "sense": "to make more specific",
      "word": "daraltmak"
    }
  ],
  "word": "narrow down"
}