time to have a beer; an appropriate or acceptable time of day to start drinking beer: The minute our shift is over, it’s beer o’clock.
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British Dictionary definitions for beer o’clock
facetious the time of day when it is acceptable or customary to start drinking alcohol
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