knock off one's feet

To surprise (someone) so much that he does not know what to do.

/Her husband's death knocked Mrs. Jones off her feet./

/When Charlie was given the prize, it knocked him off his feet for a few minutes./

Compare: BOWL OVER(2), SWEEP OFF ONE'S FEET.

Source: A Dictionary of American Idioms

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	foot [foot] See: AT ONE'S FEET, COLD FEET, DEAD ON ONE'S FEET, DRAG ONE'S FEET, FROM ... A Dictionary of American Idioms on one's feet [on one's feet] {adv. phr.} 1. Standing or walking; not sitting or lying down; up. ... A Dictionary of American Idioms to one's feet [to one's feet] {adv. phr.} To a standing position; up. * /After Henry had been ... A Dictionary of American Idioms at one's feet [at one's feet] {adv. phr.} Under your influence or power. * /She had a dozen ... A Dictionary of American Idioms sweep off one's feet [sweep off one's feet] {v. phr.} To make (someone) have feelings (as love or happiness) ... A Dictionary of American Idioms keep one's feet [keep one's feet] {v. phr.} To keep from falling or slipping down; keep your balance; ... A Dictionary of American Idioms regain one's feet [regain one's feet] {v. phr.} To get back up again after falling down. * /Tom ... A Dictionary of American Idioms