Meaning of “in the twinkling of an eye” in the English Dictionary

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"in the twinkling of an eye" in British English

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in the twinkling of an eye

If something happens in the twinkling of an eye, it happens very quickly:

Microprocessors do the calculations in the twinkling of an eye.

(Definition of “in the twinkling of an eye” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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