From Longman Dictionary of Contemporary Englishdon’t bet on it/I wouldn’t bet on itdon’t bet on it/I wouldn’t bet on itspoken used to say that you do not think something is likely to happen He said he’d finish by tomorrow, but I wouldn’t bet on it. → bet
Examples from the Corpus
don’t bet on it/I wouldn’t bet on it• Maybe he's really a nice guy, but I wouldn't bet on it. 