a light bulb goes off/on (in someone's head)

idiom

Definition of a light bulb goes off/on (in someone's head)

chiefly US, informal
used to say that a person suddenly understands something or has a great ideaAfter thinking about the problem for several days, a light bulb went off in her head, and she knew how to solve it.

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“A light bulb goes off/on (in someone's head).” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/a%20light%20bulb%20goes%20off/on%20(in%20someone's%20head). Accessed 10 December 2019.

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