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knock sb sideways/for six

UK informal

Definition

to shock or upset someone very much, or to make someone very ill: That flu really knocked me sideways. The news of his death knocked me for six.Making people sad, shocked and upsetNot fit and healthyThin or slender (of people)
(Definition of knock sb sideways/for six from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)