a light bulb goes on in (one's) brain

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a light bulb goes on in (one's) brain

One is suddenly struck with an ingenious or inspired idea, insight, or revelation. We spent hours trying to come up with a solution, when suddenly a light bulb went on in my brain. I kept feeding him subtle hints about the truth of the matter, waiting for a light bulb to go on in his brain.
See also: brain, bulb, goes, light, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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