pick someone's brain
US /pɪk ˈsʌm.wʌnz breɪn/
UK /pɪk ˈsʌm.wʌnz breɪn/

1.
consultar a alguien, pedir la opinión de alguien
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?
¿Puedo consultarte sobre tu experiencia al iniciar un negocio?
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I need to pick John's brain about the new software.
Necesito consultar a John sobre el nuevo software.