pick someone's brains


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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 brains

or

pick someone's brain

INFORMAL
If you pick someone's brains or pick their brain, you ask them for advice or information. I'd like to pick your brains about something. Nothing urgent. She, in turn, picked my brains about London as she was thinking about a trip to England. He has helped me enormously over the last few years. We used to travel down to training together and I was always picking his brain for information.
See also: brain, pick

pick someone's brains (or brain)

question someone who is better informed about a subject than yourself in order to obtain information. informal
See also: brain, pick