Idiom Definition:
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"to pick someone's brain"
to question someone, who knows more than you do, to obtain specific information
Synonyms:
advise, argue, bargain, blitz, brainstorm, breeze, confab, confabulation, consult, converse, deal, debate, discourse, flap, gab, group-think, huddle, jaw, negotiate, parley, speak, talk, treat
Literally,
picking someone's brain ...