sweep one off feet
sweep (one) off (one's) feet
To charm one in such a way that they form an instant and strong romantic attraction, usually unexpectedly. A: "Is Lucy still gushing about her new boyfriend?" B: "Yeah, he must have really swept her off her feet."
sweep one off one's feetand 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.