From Longman Dictionary of Contemporary Englishsooner or latersooner or laterEVENTUALLYused to say that something is certain to happen at some time in the future, though you cannot be sure exactly when His wife’s bound to find out sooner or later. → soon
Examples from the Corpus
sooner or later• I'm sure Brian will turn up sooner or later.• She's bound to find out sooner or later.• He is worried that sooner or later his business will fail.• Sooner or later this would end up in the papers, and I would be out of a job. 