From Longman Dictionary of Contemporary Englishad nauseamad nau‧se‧am /ˌæd ˈnɔːziəm, -iæm $ -ˈnɒː-/ adverb OFTENif you say or do something ad nauseam, you say or do it so often that it becomes annoying for other people Look, we’ve been over this ad nauseam. I think we should move on to the next item.
Examples from the Corpus
ad nauseam• All these old rules have been taught and repeated ad nauseam.Origin ad nauseam (1600-1700) Latin “to sickness” 