"brainache" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "brain",
        "3": "ache"
      },
      "expansion": "brain + ache",
      "name": "com"
    }
  ],
  "etymology_text": "From brain + ache.",
  "forms": [
    {
      "form": "brainaches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "brainache (countable and uncountable, plural brainaches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A headache, especially one apparently resulting from thinking hard or being puzzled."
      ],
      "id": "en-brainache-en-noun-LgS69jOI",
      "links": [
        [
          "headache",
          "headache"
        ],
        [
          "think",
          "think"
        ],
        [
          "puzzled",
          "puzzled"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "brainache"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "brain",
        "3": "ache"
      },
      "expansion": "brain + ache",
      "name": "com"
    }
  ],
  "etymology_text": "From brain + ache.",
  "forms": [
    {
      "form": "brainaches",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "brainache (countable and uncountable, plural brainaches)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English compound terms",
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "English uncountable nouns",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A headache, especially one apparently resulting from thinking hard or being puzzled."
      ],
      "links": [
        [
          "headache",
          "headache"
        ],
        [
          "think",
          "think"
        ],
        [
          "puzzled",
          "puzzled"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ]
    }
  ],
  "word": "brainache"
}