Knock sb sideways/for six British Australia Verb + object/complement informal
To make someone feel very shocked, overwhelmed, upset or ill
What he said knocked me for six.
The decision my parents made really knocked me sideways.
The verb "knock" should be conjugated according to its tense.
To overcome some disadvantage or get out of a bad situation when you have already lost a lot of time for it
We love Tim but we all think that it's impossible he can make up leeway and win first place in the race.