pick someone's brain
Obtain ideas or information from another person, as in I'm out of ideas for decorating—let me pick your brain. This term alludes to picking clean a carcass. [Mid-1800s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.