Definition of knock (someone) sideways
- 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
What made you want to look up knock (someone) sideways? Please tell us where you read or heard it (including the quote, if possible).