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Phrase(s): sweep one off one’s feet [and] knock one off one’s feet
1. Lit. to knock someone down. • The wind swept me off my feet. • Bill punched Bob playfully, and knocked him off his feet. 2. Fig. to overwhelm someone (figuratively). • Mary is madly in love with Bill. He swept her off her feet. • The news was so exciting that it knocked me off my feet.
McGrawhill's American Idioms And Phrasal Verbs