"pick someone's brain" meaning in English

{
  "forms": [
    {
      "form": "picks someone's brain",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "picking someone's brain",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "picked someone's brain",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "picked someone's brain",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "pick someone's brain (third-person singular simple present picks someone's brain, present participle picking someone's brain, simple past and past participle picked someone's brain)",
      "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 entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English light verb constructions",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "examples": [
        {
          "text": "After I spent a couple of hours picking his brain, his scheme started to make sense."
        }
      ],
      "glosses": [
        "To seek information from someone knowledgeable; to ask questions of someone."
      ],
      "id": "en-pick_someone's_brain-en-verb-fQJD9ryZ",
      "links": [
        [
          "seek",
          "seek"
        ],
        [
          "information",
          "information"
        ],
        [
          "knowledgeable",
          "knowledgeable"
        ],
        [
          "question",
          "question"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To seek information from someone knowledgeable; to ask questions of someone."
      ],
      "related": [
        {
          "word": "compare notes"
        }
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-pick someone's brain.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e4/En-au-pick_someone%27s_brain.ogg/En-au-pick_someone%27s_brain.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/e/e4/En-au-pick_someone%27s_brain.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "pick someone's brain"
}

{
  "forms": [
    {
      "form": "picks someone's brain",
      "tags": [
        "present",
        "singular",
        "third-person"
      ]
    },
    {
      "form": "picking someone's brain",
      "tags": [
        "participle",
        "present"
      ]
    },
    {
      "form": "picked someone's brain",
      "tags": [
        "participle",
        "past"
      ]
    },
    {
      "form": "picked someone's brain",
      "tags": [
        "past"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "*"
      },
      "expansion": "pick someone's brain (third-person singular simple present picks someone's brain, present participle picking someone's brain, simple past and past participle picked someone's brain)",
      "name": "en-verb"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
  "related": [
    {
      "word": "compare notes"
    }
  ],
  "senses": [
    {
      "categories": [
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English idioms",
        "English lemmas",
        "English light verb constructions",
        "English multiword terms",
        "English terms with audio links",
        "English terms with non-redundant non-automated sortkeys",
        "English verbs"
      ],
      "examples": [
        {
          "text": "After I spent a couple of hours picking his brain, his scheme started to make sense."
        }
      ],
      "glosses": [
        "To seek information from someone knowledgeable; to ask questions of someone."
      ],
      "links": [
        [
          "seek",
          "seek"
        ],
        [
          "information",
          "information"
        ],
        [
          "knowledgeable",
          "knowledgeable"
        ],
        [
          "question",
          "question"
        ]
      ],
      "raw_glosses": [
        "(idiomatic) To seek information from someone knowledgeable; to ask questions of someone."
      ],
      "tags": [
        "idiomatic"
      ]
    }
  ],
  "sounds": [
    {
      "audio": "En-au-pick someone's brain.ogg",
      "mp3_url": "https://upload.wikimedia.org/wikipedia/commons/transcoded/e/e4/En-au-pick_someone%27s_brain.ogg/En-au-pick_someone%27s_brain.ogg.mp3",
      "ogg_url": "https://upload.wikimedia.org/wikipedia/commons/e/e4/En-au-pick_someone%27s_brain.ogg",
      "tags": [
        "Australia"
      ],
      "text": "Audio (AU)"
    }
  ],
  "word": "pick someone's brain"
}