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in a flash
01
happening extremely quickly, often before one has time to react or notice
Slang
Grammatical Information
What does "in a flash" mean in speed slang?
The phrase "in a flash" means very quickly or almost instantly. The structure is a metaphor where "flash" refers to a brief burst of light, extended to indicate extreme speed or immediacy. It is informal idiomatic slang commonly used in everyday speech to describe something happening without delay.
Examples
The storm passed in a flash, leaving clear skies behind.
