She had a eureka moment and solved the puzzle.
eureka moment
idiomThe moment of a sudden unexpected discovery.
After hours of staring at the data, the scientist suddenly had a eureka moment and understood the pattern.
Walking through the autumn rain, the poet experienced a eureka moment: the ending she had sought for months arrived fully formed, as if whispered by the wind itself.
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aha moment
The moment or instant at which the solution to a problem, or some other significant realization, becomes clear.
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at any given moment
At any point in time.
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Hallmark moment
A memorable moment or event, one which would either make for or call for a poignant greeting card.
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have a moment
To reach a high level of popularity during a specific time.
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Hollywood moment
A moment of great drama or sentimentality, suggesting the climax of a film.
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light-bulb moment
A moment of enlightenment, inspiration or sudden realization.
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moment in the sun
A brief instance in which an otherwise obscure, unremarkable, or humble person draws attention.
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moment of truth
A deciding instant; the time when a test determines or makes it apparent whether something will succeed.