Definition of knock (someone) sidewaysBritish
- The news about his mother's accident really knocked him sideways.
: to strike something with a sharp blow
: to collide with something
: a sharp blow : rap, hit
: a severe misfortune or hardship
: setback, reversal
: some person : somebody
: from one side
: with one side forward
: in a lateral direction or downward to one side
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