knock (someone) sideways

idiom

Definition of knock (someone) sideways

British
: to upset, confuse, or shock (someone) very much The news about his mother's accident really knocked him sideways.

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“Knock (someone) sideways.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/knock%20%28someone%29%20sideways. Accessed 28 Oct. 2020.

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