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pick (one's) brain(s)
To get detailed information or advice from someone. You should pick John's brain sometime; he knows all about car engines. I've just started playing professionally, and I'd love to pick your brains for any tips you might have.
See also: pick
pick someone's brain(s)
Fig. to talk with someone to find out information about something. I spent the afternoon with Donna, picking her brain for ideas to use in our celebration. Do you mind if I pick your brains? I need some fresh ideas.