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light bulb moment

(informal) a moment of sudden inspiration, revelation, or recognition
Word Origin
C20: from the cartoon image of a light bulb lighting up above a character's head when he or she has an idea
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
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