Etymology
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hangover (n.)

also hang-over, 1894, "a survival, a thing left over from before," from hang (v.) + over. Meaning "after-effect of excessive drinking" is attested by 1902, American English, on notion of something left over from the night before. As an adjective, in reference to a person, overhung (1964) has been used but is rare; that word meaning generally "placed so as to project or jut out" (1708).

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Definitions of hangover

hangover (n.)
disagreeable aftereffects from the use of drugs (especially alcohol);
Synonyms: katzenjammer
hangover (n.)
an official who remains in office after his term;
Synonyms: holdover
hangover (n.)
something that has survived from the past;
hangovers from the 19th century
Synonyms: holdover
From wordnet.princeton.edu