eureka moment
noun
variants:
or less commonly Eureka moment
Definition of eureka moment
: a moment of sudden, triumphant discovery, inspiration, or insight
… he would later tell, over and over, the story of how the idea for the collection came to him—the Eureka moment—improving it with each rendition.— Donald Dale Jackson, Smithsonian, October 1988 Then one day, listening to a Communist fulminator in Pioneer Square, he'd had a eureka moment in which he realized that the way to get ahead in his new country was to exploit some labor himself.— Jonathan Franzen, Freedom, 2010
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