Very quickly; in a short time.
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Extremely quickly — so fast it is almost impossible to notice.
When something happens in the blink of an eye, it occurs instantly or in a very short amount of time.
It is used to emphasize how sudden or fleeting a moment was.
"Out of Nowhere"
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Happening suddenly and unexpectedly with no prior signs or warning
"At the Drop of a Hat"
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Doing something immediately without hesitation or needing to be asked twice
"In the Blink of an Eye"
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Something happening so fast it is almost impossible to notice