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."
See also: feet, off, sweep
Farlex Dictionary of Idioms.

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.
See also: feet, off, one, sweep
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • sweep (one) off (one's) feet
  • sweep off feet
  • sweep somebody off their feet
  • sweep someone off their feet
  • be head over heels (in love)
  • fall head over heels in love
  • fall head over heels in love with (someone)
  • pull the carpet (out) from under (one's) feet
  • pull the carpet/rug out from under somebody's feet
  • pull the rug out (from (under) one)