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1.
To probe for answers
If you have a minute to spare, I'd like to pick your brain about lachrymology.
by DGirard July 04, 2005
 
2.
understand more, in detail and in general, to learn someone's behaviour and the nature of how someone thinks, what motivation of the persons actions, what triggers the feeling etc.
I'd like to pick your brains out, let's have an in-depth discussion on this...
by Rico Fikri November 26, 2008