/ ˈhæŋəʊvə(r); NAmE -oʊvər/ noun
1.
the headache and sick feeling that you have the day after drinking too much alcohol :
She woke up with a terrible hangover.
2.
[ usually sing. ] hangover (from sth) a feeling, custom, idea, etc. that remains from the past, although it is no longer practical or suitable :
the insecure feeling that was a hangover from her childhood
hangover laws from the previous administration
—see also holdover