The term "being surety for" refers to the act of guaranteeing a loan or debt for someone else. Antonyms for this phrase could include terms such as "refusing to guarantee," "withdrawing support," "declining to back," or simply "not endorsing." When someone is surety for another person, they are essentially taking on financial responsibility for someone else's debts, which can pose a risk to their own financial security. Thus, choosing not to be surety for someone can be a wise decision, particularly if there are doubts about the other person's ability to repay the loan. Ultimately, the decision to be surety for someone else should be made with careful consideration and a full understanding of the potential risks involved.