Break the bank is a phrase that means to spend a lot of money, sometimes more than one can afford. There are several antonyms for this phrase, which means the opposite of breaking the bank. One antonym is frugal, which means to be careful and economical with money. Another antonym is budget-friendly, which implies that something is affordable and won't put a strain on an individual's finances. Additionally, thrifty, penny-wise, and economical are also antonyms of break the bank. These words all convey the idea of being sensible and prudent with finances, rather than spending excessively and breaking the bank.