in a/the flash of an/the eye(redirected from in the flash of an eye)
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in a/the flash of an/the eye
So quickly as to seem almost imperceptible (i.e., in the space of time it takes a person to blink). In the flash of an eye, the home team has taken total control of this match. Working on Wall Street, you get used to massive financial changes happening in a flash of the eye.