pick someone's brains
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pick someone's brainsor
pick someone's brainINFORMAL
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.