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English definition of “not know what has hit you”

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not know what has hit you

informal
to be shocked and surprised because something unpleasant suddenly and unexpectedly happens to you: You wait till he starts working for Michael - he won't know what's hit him!
Translations of “not know what has hit you”
in Chinese (Traditional) 感到震驚, 倉皇失措…
in Chinese (Simplified) 感到震惊, 仓皇失措…
(Definition of not know what has hit you from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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