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Meaning of morning after

morn'ing af'ter

Pronunciation: [key]
— pl. mornings after.
  1. a period, as in the morning, when the aftereffects of excessive self-indulgence during the previous evening are felt, esp. the aftereffects of excessive drinking of alcoholic beverages.
  2. a moment or period of realization in which the consequences of an earlier ill-advised action are recognized or brought home to one.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.