Meaning of “not know what has hit you” in the English Dictionary

british dictionary

"not know what has hit you" in British English

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not know what has hit you


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!

(Definition of “not know what has hit you” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

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