Also, as soon. Rather, more readily; also, equally. For example, I'd just as soon you took care of it, or I would as soon recover before I go and baby-sit, or I'd as soon have the lamb as the beef. [Late 1500s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.