the disagreeable physical aftereffects of drunkenness, such as a headache or stomach disorder, usually felt several hours after cessation of drinking.
something remaining behind from a former period or state of affairs.
any aftermath of or lingering effect from a distressing experience: the post-Watergate hangover in Washington.

1890–95, Americanism; noun use of verb phrase hang over

1. queasiness, sickishness, qualm, nausea.
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World English Dictionary
hangover (ˈhæŋˌəʊvə)
1.  the delayed aftereffects of drinking too much alcohol in a relatively short period of time, characterized by headache and sometimes nausea and dizziness
2.  a person or thing left over from or influenced by a past age

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1894, "survival," from hang + over. Meaning "after-effect of drinking too much" is first attested 1904, on notion of something left over from the night before.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And the best thing after a hangover position is to not compound the mistake
  with more drinking.
The only certain way to avoid a hangover is to limit your drinking.
There is probably no hangover that comes anywhere close to the hangover from an
And by the next morning, you're likely to feel awful-the throbbing,
  band-around-the-head feeling of a migraine or a hangover.
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