Antonyms for the phrase "make a bundle" could revolve around losing or spending money. Examples include "lose a fortune," "spend a fortune," "blow your savings," "go broke," "empty your pockets," or "waste your assets." "Make a bundle" typically implies making a lot of money quickly or easily, so an antonym could also involve working hard for little pay, such as "scrape by," "earn a pittance," or "make ends meet." Another antonym could be to keep money in a safe or frugal manner, such as "save wisely," "live frugally," or "hoard your assets.