pick brain

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Related to pick brains: all brawn no brains

pick (one's) brain(s)

To ask one questions in order to obtain detailed information or advice. 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.
See also: brain, pick