an experience or disclosure that gives one a sudden realization or understanding: Her disclosures about her childhood were a real eyeopener.
a drink of liquor taken early in the day and intended to wake a person up fully.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
British Dictionary definitions for eye-opener
something startling or revealing
US and Canadian an alcoholic drink taken early in the morning
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012