the time when one is called to account for one's actions, to pay one's debts, or to fulfill one's promises or obligations.
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British Dictionary definitions for day of reckoning
a time when the effects of one's past mistakes or misdeeds catch up with one
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