From Longman Dictionary of Contemporary Englishsomebody will live to regret itsomebody will live to regret itREGRET/FEEL SORRYused to say that someone will wish that they had not done something If you marry him, you’ll live to regret it. → live
Examples from the Corpus
somebody will live to regret it• He may think leaving his wife for the other woman is a good idea, but he'll live to regret it.• If you put all your money in this real estate deal, I guarantee you'll live to regret it. 