pick someone's brain
US /pɪk ˈsʌm.wʌnz breɪn/
UK /pɪk ˈsʌm.wʌnz breɪn/
1.
to ask someone who knows a lot about a subject for information or their opinion
:
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Can I pick your brain about your experience with starting a business?
•
I need to pick John's brain about the new software.