hangoverPronunciation: /ˈhaŋəʊvə/Translate hangover | into French | into German | into Italian | into Spanish Definition of hangover noun 1a severe headache or other after-effects caused by drinking an excess of alcohol. 2a custom, habit, feeling, etc. that survives from the past:this feeling of insecurity was in part a hangover from her schooldayshangover in other Oxford dictionaries Definition of hangover in the US English dictionary