knowledge-box

knowledge-box

One's brain, skull, or head. It's a good thing I was wearing a helmet when I fell off my bike, or I would have cracked open my knowledge-box! I don't know how you store so many facts in that knowledge-box of yours!
Farlex Dictionary of Idioms.

knowledge-box

n. the head. Now, I want to get this into your knowledge-box once and for all.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • get off (one's) bike
  • get off your bike
  • padded
  • brain bucket
  • get on (one's) bike
  • get on your bike
  • cracked up as (something)
  • hop off
  • hop off (of something)
  • on your bike