know what hit one

idiom

Definition of know what hit one

used in negative statements to say that something one did not expect surprised one very muchI didn't know what hit me—suddenly I just felt so dizzy.The company came out with an entirely new line of products last year, and their competitors never knew what hit them.

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“Know what hit one.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/know%20what%20hit%20one. Accessed 19 Sep. 2020.

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