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aha moment

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noun Informal.
  1. a point in time, event, or experience when one has a sudden insight or realization: My aha moment was when I put on my shorts from last summer and they didn’t fit.
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Origin of aha moment

from the expression aha, used to signal sudden awareness or comprehension
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for aha moment

aha moment

noun
  1. an instant at which the solution to a problem becomes clear
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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