before one knows it

idiom

Definition of before one knows it

: very quickly or soon We'll be there before you know it. The game was over before I knew it.

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“Before one knows it.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/before%20one%20knows%20it. Accessed 12 Jun. 2021.

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