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 not wonder, worry or be surprised about what is not predicted will happen in life because anything could happen
Sometimes, the secret to stay happy is to expect the unexpected.