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Phrase(s): throw someone off balance
1. Lit. to cause someone to falter (and probably fall). • The cyclist bumped into me and threw me off balance. • I was thrown off balance by the gust of wind. 2. Fig. to confuse or disorient one. • Your last question sort of threw me off balance. • The teacher was thrown off balance by the students’ difficult questions.
McGrawhill's American Idioms And Phrasal Verbs