Meaning of “before you know it” in the English Dictionary

british dictionary

"before you know it" in British English

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before you know it

C1 very soon:

We'll be on our way out again before you know it.

(Definition of “before you know it” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"before you know it" in American English

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before you know it

very soon:

A week seems like a long time, but Saturday will be here before you know it.

(Definition of “before you know it” from the Cambridge Academic Content Dictionary © Cambridge University Press)