From Longman Dictionary of Contemporary Englishpick somebody’s brainspick somebody’s brainsASK FOR something/ASK somebody TO DO somethingto ask someone who knows a lot about something for information and advice about it Have you got a minute? I need to pick your brains. → pick
Examples from the Corpus
pick somebody’s brains• You know all about tax law - can I pick your brains for a minute?• The workshop is designed so that new managers can pick the brains of managers with more experience. 