would as soon do as look at you

would (just) as soon (do something) as look at (one)

Would desire or be very willing to do something harmful or malicious to one. Don't go messing with that guy, Jake—he'd as soon kill you as look at you. I really hate that braggart. I would as soon knock his block off as look at him.
See also: look, soon
Farlex Dictionary of Idioms.

would as soon do something as look at you

Rur. would be eager to do something harmful as simply look at you. He was a mean so-and-so who would as soon shoot you as look at you. He'd as soon pick a fight as look at you.
See also: look, soon
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • would (just) as soon (do something) as look at (one)
  • ugly customer
  • give (one) (one's) marching orders
  • give somebody their marching orders
  • give someone their marching orders
  • give someone their walking papers
  • give somebody their walking papers
  • give (one) (one's) walking papers
  • mess about with (someone or something)
  • mess about with someone