super-strap

super-strap

slang A diligent, overearnest student. My brother was such a burnout during high school, so it's weird seeing him turn into such a total super-strap later in life.
Farlex Dictionary of Idioms.

super-strap

n. an earnest and hardworking student. (As compared to a jock; strap; superjock.) I couldn’t be a super-strap even if I had the brains. I just don’t care that much.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • strap in
  • strap up
  • (I'll) be seeing ya
  • (I'll) be seeing you
  • be seeing you
  • I'll be seeing you
  • strap someone with someone or something
  • strap into (something)
  • strap down
  • straphanger