in a flash

idiom

Definition of in a flash

informal
: very quickly or suddenly I'll be back in a flash. The idea came to me in a flash.

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in a flap

in a flash

in a good light

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“In a flash.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20a%20flash. Accessed 9 Aug. 2022.

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