sweep off one's feet, to

sweep (someone) off (someone's) feet

To cause someone to be admiring or infatuated.
See also: feet, off, sweep
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

sweep off one's feet, to

To overwhelm; to carry away with enthusiasm. This metaphor suggests knocking a person down, or at least sideways, in the process of making an impression. The term, also put as to carry someone off his feet, dates from the nineteenth century. Clarence Day used it in The Crow’s Nest (1921): “You can’t sweep other people off their feet if you can’t be swept off your own.”
See also: off, sweep
The Dictionary of Clichés by Christine Ammer Copyright © 2013 by Christine Ammer
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