pick (someone's) brains

to ask for information or advice from someone who knows more about a subject than you do.

I'd love to pick your brains about computers - you seem to be the expert around here.

• by degrees
• by dint of
• by dint of something
• by fair means or foul
• by far
• by hand
• by heart
• by hook or by crook
• by leaps and bounds
• by mistake
• by no means
• by rote
• by the back door
• by the book
• by the dozen
• by the name
• by the name of
• by the same token
• by the seat of pants
• by the seat of your pants
• by the skin of teeth
• by the skin of your teeth
• by the sweat of brow
• by the sweat of your brow
• by the way