The phrase "sweep off one's feet" implies an intense romantic or emotional experience that overwhelms someone. The antonyms for this phrase could include terms like "turn off," "repel," "reject," or "disappoint." These words suggest the opposite of being swept off one's feet, and convey negative feelings or experiences instead. Other antonyms that could be used include "ignore," "neglect," "underwhelm," or "bore." These words all suggest a lack of interest or enthusiasm, which is the opposite of being swept away by strong emotions. Therefore, there are many words that could be used as antonyms for the phrase "sweep off one's feet," all of which convey a very different emotional experience.