Definition of ad nauseam adverb from the Oxford Advanced Learner's Dictionary

 

ad nauseam

 adverb
adverb
BrE BrE//ˌæd ˈnɔːziæm//
 
; NAmE NAmE//ˌæd ˈnɔːziæm//
 
(from Latin)
 
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if a person says or does something ad nauseam, they say or do it again and again so that it becomes boring or annoying Sports commentators repeat the same phrases ad nauseam. Word OriginLatin, literally ‘to sickness’.
See the Oxford Advanced American Dictionary entry: ad nauseam