Meaning of “the next thing I knew” in the English Dictionary

british dictionary

"the next thing I knew" in British English

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the next thing I knew

informal

C2 used to talk about part of a story that happens in a sudden and surprising way:

A car came speeding around the corner, and the next thing I knew I was lying on the ground.

(Definition of “the next thing I knew” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)