the next thing I knew

idiom

Definition of the next thing I knew

used to say that something happened right after something elseI slipped, and the next thing I knew, I was lying face up on the ground.

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“The next thing I knew.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/the%20next%20thing%20I%20knew. Accessed 2 Dec. 2020.

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