before one knows it

English

Phrase

before one knows it

rapidly (and sometimes unexpectedly)
before you know it

See also

before you can say knife

Further reading

“before you know it” in Longman Dictionary of Contemporary English, Longman.
“before you know it” in the Cambridge English Dictionary, Cambridge: Cambridge University Press.
“before one knows it”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.

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